Annotation of src/sys/arch/sparc/sparc/locore.s, Revision 1.125.2.2
1.125.2.2! bouyer 1: /* $NetBSD: locore.s,v 1.125.2.1 2000/11/20 20:25:45 bouyer Exp $ */
1.70 mrg 2:
1.1 deraadt 3: /*
1.52 pk 4: * Copyright (c) 1996 Paul Kranenburg
5: * Copyright (c) 1996
1.55 abrown 6: * The President and Fellows of Harvard College. All rights reserved.
1.1 deraadt 7: * Copyright (c) 1992, 1993
8: * The Regents of the University of California. All rights reserved.
9: *
10: * This software was developed by the Computer Systems Engineering group
11: * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
12: * contributed to Berkeley.
13: *
14: * All advertising materials mentioning features or use of this software
15: * must display the following acknowledgement:
16: * This product includes software developed by the University of
17: * California, Lawrence Berkeley Laboratory.
1.52 pk 18: * This product includes software developed by Harvard University.
1.1 deraadt 19: *
20: * Redistribution and use in source and binary forms, with or without
21: * modification, are permitted provided that the following conditions
22: * are met:
23: * 1. Redistributions of source code must retain the above copyright
24: * notice, this list of conditions and the following disclaimer.
25: * 2. Redistributions in binary form must reproduce the above copyright
26: * notice, this list of conditions and the following disclaimer in the
27: * documentation and/or other materials provided with the distribution.
28: * 3. All advertising materials mentioning features or use of this software
29: * must display the following acknowledgement:
30: * This product includes software developed by the University of
31: * California, Berkeley and its contributors.
1.52 pk 32: * This product includes software developed by Harvard University.
33: * This product includes software developed by Paul Kranenburg.
1.1 deraadt 34: * 4. Neither the name of the University nor the names of its contributors
35: * may be used to endorse or promote products derived from this software
36: * without specific prior written permission.
37: *
38: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
39: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
40: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
41: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
42: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
43: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
44: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
45: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
46: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
47: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
48: * SUCH DAMAGE.
49: *
1.10 deraadt 50: * @(#)locore.s 8.4 (Berkeley) 12/10/93
1.1 deraadt 51: */
52:
1.85 jonathan 53: #include "opt_ddb.h"
1.84 thorpej 54: #include "opt_compat_svr4.h"
1.116 christos 55: #include "opt_compat_sunos.h"
1.97 pk 56: #include "opt_multiprocessor.h"
1.125.2.1 bouyer 57: #include "opt_lockdebug.h"
1.80 mrg 58:
1.47 mycroft 59: #include "assym.h"
1.52 pk 60: #include <machine/param.h>
1.111 pk 61: #include <machine/asm.h>
1.1 deraadt 62: #include <sparc/sparc/intreg.h>
63: #include <sparc/sparc/timerreg.h>
1.52 pk 64: #include <sparc/sparc/vaddrs.h>
1.1 deraadt 65: #ifdef notyet
66: #include <sparc/dev/zsreg.h>
67: #endif
68: #include <machine/ctlreg.h>
69: #include <machine/psl.h>
70: #include <machine/signal.h>
71: #include <machine/trap.h>
1.92 pk 72: #include <sys/syscall.h>
1.116 christos 73: #ifdef COMPAT_SUNOS
74: #include <compat/sunos/sunos_syscall.h>
75: #endif
1.41 christos 76: #ifdef COMPAT_SVR4
77: #include <compat/svr4/svr4_syscall.h>
78: #endif
1.1 deraadt 79:
80: /*
81: * GNU assembler does not understand `.empty' directive; Sun assembler
82: * gripes about labels without it. To allow cross-compilation using
83: * the Sun assembler, and because .empty directives are useful documentation,
84: * we use this trick.
85: */
86: #ifdef SUN_AS
87: #define EMPTY .empty
88: #else
89: #define EMPTY /* .empty */
90: #endif
91:
92: /* use as needed to align things on longword boundaries */
1.52 pk 93: #define _ALIGN .align 4
1.1 deraadt 94:
95: /*
96: * CCFSZ (C Compiler Frame SiZe) is the size of a stack frame required if
97: * a function is to call C code. It should be just 64, but Sun defined
98: * their frame with space to hold arguments 0 through 5 (plus some junk),
1.63 pk 99: * and varargs routines (such as printf) demand this, and gcc uses this
1.1 deraadt 100: * area at times anyway.
101: */
102: #define CCFSZ 96
103:
104: /*
105: * A handy macro for maintaining instrumentation counters.
106: * Note that this clobbers %o0 and %o1. Normal usage is
107: * something like:
108: * foointr:
109: * TRAP_SETUP(...) ! makes %o registers safe
1.111 pk 110: * INCR(cnt+V_FOO) ! count a foo
1.1 deraadt 111: */
112: #define INCR(what) \
113: sethi %hi(what), %o0; \
114: ld [%o0 + %lo(what)], %o1; \
115: inc %o1; \
116: st %o1, [%o0 + %lo(what)]
117:
118: /*
119: * Another handy macro: load one register window, given `base' address.
120: * This can be either a simple register (e.g., %sp) or include an initial
121: * offset (e.g., %g6 + PCB_RW).
122: */
123: #define LOADWIN(addr) \
124: ldd [addr], %l0; \
125: ldd [addr + 8], %l2; \
126: ldd [addr + 16], %l4; \
127: ldd [addr + 24], %l6; \
128: ldd [addr + 32], %i0; \
129: ldd [addr + 40], %i2; \
130: ldd [addr + 48], %i4; \
131: ldd [addr + 56], %i6
132:
133: /*
134: * To return from trap we need the two-instruction sequence
135: * `jmp %l1; rett %l2', which is defined here for convenience.
136: */
137: #define RETT jmp %l1; rett %l2
138:
139: .data
140: /*
141: * The interrupt stack.
142: *
143: * This is the very first thing in the data segment, and therefore has
144: * the lowest kernel stack address. We count on this in the interrupt
145: * trap-frame setup code, since we may need to switch from the kernel
146: * stack to the interrupt stack (iff we are not already on the interrupt
147: * stack). One sethi+cmp is all we need since this is so carefully
148: * arranged.
1.98 pk 149: *
150: * In SMP kernels, each CPU has its own interrupt stack and the computation
151: * to determine whether we're already on the interrupt stack is slightly
152: * more time consuming (see INTR_SETUP() below).
1.1 deraadt 153: */
1.111 pk 154: .globl _C_LABEL(intstack)
155: .globl _C_LABEL(eintstack)
156: _C_LABEL(intstack):
1.98 pk 157: .skip INT_STACK_SIZE ! 16k = 128 128-byte stack frames
1.111 pk 158: _C_LABEL(eintstack):
1.1 deraadt 159:
1.101 pk 160: _EINTSTACKP = CPUINFO_VA + CPUINFO_EINTSTACK
161:
1.1 deraadt 162: /*
1.125.2.1 bouyer 163: * CPUINFO_VA is a CPU-local virtual address; cpi->ci_self is a global
164: * virtual address for the same structure. It must be stored in p->p_cpu
165: * upon context switch.
166: */
167: _CISELFP = CPUINFO_VA + CPUINFO_SELF
168:
169: /*
1.1 deraadt 170: * When a process exits and its u. area goes away, we set cpcb to point
171: * to this `u.', leaving us with something to use for an interrupt stack,
172: * and letting all the register save code have a pcb_uw to examine.
173: * This is also carefully arranged (to come just before u0, so that
174: * process 0's kernel stack can quietly overrun into it during bootup, if
175: * we feel like doing that).
176: */
1.111 pk 177: .globl _C_LABEL(idle_u)
178: _C_LABEL(idle_u):
1.13 deraadt 179: .skip USPACE
1.99 pk 180: /*
181: * On SMP kernels, there's an idle u-area for each CPU and we must
182: * read its location from cpuinfo.
183: */
1.111 pk 184: IDLE_UP = CPUINFO_VA + CPUINFO_IDLE_U
1.1 deraadt 185:
186: /*
187: * Process 0's u.
188: *
189: * This must be aligned on an 8 byte boundary.
190: */
1.111 pk 191: .globl _C_LABEL(u0)
192: _C_LABEL(u0): .skip USPACE
1.1 deraadt 193: estack0:
194:
195: #ifdef KGDB
196: /*
197: * Another item that must be aligned, easiest to put it here.
198: */
199: KGDB_STACK_SIZE = 2048
1.111 pk 200: .globl _C_LABEL(kgdb_stack)
201: _C_LABEL(kgdb_stack):
1.1 deraadt 202: .skip KGDB_STACK_SIZE ! hope this is enough
203: #endif
204:
205: /*
1.111 pk 206: * cpcb points to the current pcb (and hence u. area).
1.1 deraadt 207: * Initially this is the special one.
208: */
1.111 pk 209: cpcb = CPUINFO_VA + CPUINFO_CURPCB
1.1 deraadt 210:
1.111 pk 211: /* curproc points to the current process that has the CPU */
212: curproc = CPUINFO_VA + CPUINFO_CURPROC
1.104 pk 213:
1.52 pk 214: /*
1.111 pk 215: * cputyp is the current cpu type, used to distinguish between
1.13 deraadt 216: * the many variations of different sun4* machines. It contains
217: * the value CPU_SUN4, CPU_SUN4C, or CPU_SUN4M.
1.9 deraadt 218: */
1.111 pk 219: .globl _C_LABEL(cputyp)
220: _C_LABEL(cputyp):
1.9 deraadt 221: .word 1
1.52 pk 222:
1.18 deraadt 223: #if defined(SUN4C) || defined(SUN4M)
1.111 pk 224: cputypval:
1.18 deraadt 225: .asciz "sun4c"
226: .ascii " "
1.111 pk 227: cputypvar:
1.37 pk 228: .asciz "compatible"
1.52 pk 229: _ALIGN
1.18 deraadt 230: #endif
231:
1.13 deraadt 232: /*
233: * There variables are pointed to by the cpp symbols PGSHIFT, NBPG,
234: * and PGOFSET.
235: */
1.111 pk 236: .globl _C_LABEL(pgshift), _C_LABEL(nbpg), _C_LABEL(pgofset)
237: _C_LABEL(pgshift):
1.52 pk 238: .word 0
1.111 pk 239: _C_LABEL(nbpg):
1.52 pk 240: .word 0
1.111 pk 241: _C_LABEL(pgofset):
1.52 pk 242: .word 0
243:
1.111 pk 244: .globl _C_LABEL(trapbase)
245: _C_LABEL(trapbase):
1.52 pk 246: .word 0
1.9 deraadt 247:
1.75 pk 248: #if 0
1.9 deraadt 249: #if defined(SUN4M)
250: _mapme:
251: .asciz "0 0 f8000000 15c6a0 map-pages"
252: #endif
1.75 pk 253: #endif
1.9 deraadt 254:
255: #if !defined(SUN4M)
256: sun4m_notsup:
1.20 deraadt 257: .asciz "cr .( NetBSD/sparc: this kernel does not support the sun4m) cr"
1.9 deraadt 258: #endif
1.13 deraadt 259: #if !defined(SUN4C)
1.9 deraadt 260: sun4c_notsup:
1.20 deraadt 261: .asciz "cr .( NetBSD/sparc: this kernel does not support the sun4c) cr"
1.13 deraadt 262: #endif
263: #if !defined(SUN4)
264: sun4_notsup:
1.20 deraadt 265: ! the extra characters at the end are to ensure the zs fifo drains
266: ! before we halt. Sick, eh?
267: .asciz "NetBSD/sparc: this kernel does not support the sun4\n\r \b"
1.9 deraadt 268: #endif
1.52 pk 269: _ALIGN
1.9 deraadt 270:
1.1 deraadt 271: .text
272:
273: /*
1.26 deraadt 274: * The first thing in the real text segment is the trap vector table,
275: * which must be aligned on a 4096 byte boundary. The text segment
276: * starts beyond page 0 of KERNBASE so that there is a red zone
277: * between user and kernel space. Since the boot ROM loads us at
1.119 christos 278: * PROM_LOADADDR, it is far easier to start at KERNBASE+PROM_LOADADDR than to
1.26 deraadt 279: * buck the trend. This is two or four pages in (depending on if
280: * pagesize is 8192 or 4096). We place two items in this area:
1.75 pk 281: * the message buffer (phys addr 0) and the cpu_softc structure for
282: * the first processor in the system (phys addr 0x2000).
283: * Because the message buffer is in our "red zone" between user and
1.26 deraadt 284: * kernel space we remap it in configure() to another location and
285: * invalidate the mapping at KERNBASE.
286: */
287:
1.1 deraadt 288: /*
289: * Each trap has room for four instructions, of which one perforce must
290: * be a branch. On entry the hardware has copied pc and npc to %l1 and
291: * %l2 respectively. We use two more to read the psr into %l0, and to
292: * put the trap type value into %l3 (with a few exceptions below).
293: * We could read the trap type field of %tbr later in the code instead,
294: * but there is no need, and that would require more instructions
295: * (read+mask, vs 1 `mov' here).
296: *
297: * I used to generate these numbers by address arithmetic, but gas's
298: * expression evaluator has about as much sense as your average slug
299: * (oddly enough, the code looks about as slimy too). Thus, all the
300: * trap numbers are given as arguments to the trap macros. This means
301: * there is one line per trap. Sigh.
302: *
303: * Note that only the local registers may be used, since the trap
304: * window is potentially the last window. Its `in' registers are
305: * the previous window's outs (as usual), but more important, its
306: * `out' registers may be in use as the `topmost' window's `in' registers.
307: * The global registers are of course verboten (well, until we save
308: * them away).
309: *
310: * Hardware interrupt vectors can be `linked'---the linkage is to regular
311: * C code---or rewired to fast in-window handlers. The latter are good
312: * for unbuffered hardware like the Zilog serial chip and the AMD audio
313: * chip, where many interrupts can be handled trivially with pseudo-DMA or
314: * similar. Only one `fast' interrupt can be used per level, however, and
315: * direct and `fast' interrupts are incompatible. Routines in intr.c
316: * handle setting these, with optional paranoia.
317: */
318:
319: /* regular vectored traps */
320: #define VTRAP(type, label) \
321: mov (type), %l3; b label; mov %psr, %l0; nop
322:
323: /* hardware interrupts (can be linked or made `fast') */
1.52 pk 324: #define HARDINT44C(lev) \
1.111 pk 325: mov (lev), %l3; b _C_LABEL(sparc_interrupt44c); mov %psr, %l0; nop
1.52 pk 326:
327: /* hardware interrupts (can be linked or made `fast') */
328: #define HARDINT4M(lev) \
1.111 pk 329: mov (lev), %l3; b _C_LABEL(sparc_interrupt4m); mov %psr, %l0; nop
1.1 deraadt 330:
331: /* software interrupts (may not be made direct, sorry---but you
332: should not be using them trivially anyway) */
1.52 pk 333: #define SOFTINT44C(lev, bit) \
334: mov (lev), %l3; mov (bit), %l4; b softintr_sun44c; mov %psr, %l0
335:
336: /* There's no SOFTINT4M(): both hard and soft vector the same way */
1.1 deraadt 337:
338: /* traps that just call trap() */
339: #define TRAP(type) VTRAP(type, slowtrap)
340:
341: /* architecturally undefined traps (cause panic) */
342: #define UTRAP(type) VTRAP(type, slowtrap)
343:
344: /* software undefined traps (may be replaced) */
345: #define STRAP(type) VTRAP(type, slowtrap)
346:
347: /* breakpoint acts differently under kgdb */
348: #ifdef KGDB
349: #define BPT VTRAP(T_BREAKPOINT, bpt)
1.52 pk 350: #define BPT_KGDB_EXEC VTRAP(T_KGDB_EXEC, bpt)
351: #else
352: #define BPT TRAP(T_BREAKPOINT)
353: #define BPT_KGDB_EXEC TRAP(T_KGDB_EXEC)
354: #endif
355:
356: /* special high-speed 1-instruction-shaved-off traps (get nothing in %l3) */
1.122 christos 357: #define SYSCALL b _C_LABEL(_syscall); mov %psr, %l0; nop; nop
1.52 pk 358: #define WINDOW_OF b window_of; mov %psr, %l0; nop; nop
359: #define WINDOW_UF b window_uf; mov %psr, %l0; nop; nop
360: #ifdef notyet
361: #define ZS_INTERRUPT b zshard; mov %psr, %l0; nop; nop
362: #else
363: #define ZS_INTERRUPT44C HARDINT44C(12)
364: #define ZS_INTERRUPT4M HARDINT4M(12)
365: #endif
366:
1.111 pk 367: .globl _ASM_LABEL(start), _C_LABEL(kernel_text)
368: _C_LABEL(kernel_text) = start ! for kvm_mkdb(8)
369: _ASM_LABEL(start):
1.52 pk 370: /*
371: * Put sun4 traptable first, since it needs the most stringent aligment (8192)
372: */
373: #if defined(SUN4)
374: trapbase_sun4:
375: /* trap 0 is special since we cannot receive it */
376: b dostart; nop; nop; nop ! 00 = reset (fake)
377: VTRAP(T_TEXTFAULT, memfault_sun4) ! 01 = instr. fetch fault
378: TRAP(T_ILLINST) ! 02 = illegal instruction
379: TRAP(T_PRIVINST) ! 03 = privileged instruction
380: TRAP(T_FPDISABLED) ! 04 = fp instr, but EF bit off in psr
381: WINDOW_OF ! 05 = window overflow
382: WINDOW_UF ! 06 = window underflow
383: TRAP(T_ALIGN) ! 07 = address alignment error
384: VTRAP(T_FPE, fp_exception) ! 08 = fp exception
385: VTRAP(T_DATAFAULT, memfault_sun4) ! 09 = data fetch fault
386: TRAP(T_TAGOF) ! 0a = tag overflow
387: UTRAP(0x0b)
388: UTRAP(0x0c)
389: UTRAP(0x0d)
390: UTRAP(0x0e)
391: UTRAP(0x0f)
392: UTRAP(0x10)
393: SOFTINT44C(1, IE_L1) ! 11 = level 1 interrupt
394: HARDINT44C(2) ! 12 = level 2 interrupt
395: HARDINT44C(3) ! 13 = level 3 interrupt
396: SOFTINT44C(4, IE_L4) ! 14 = level 4 interrupt
397: HARDINT44C(5) ! 15 = level 5 interrupt
398: SOFTINT44C(6, IE_L6) ! 16 = level 6 interrupt
399: HARDINT44C(7) ! 17 = level 7 interrupt
400: HARDINT44C(8) ! 18 = level 8 interrupt
401: HARDINT44C(9) ! 19 = level 9 interrupt
402: HARDINT44C(10) ! 1a = level 10 interrupt
403: HARDINT44C(11) ! 1b = level 11 interrupt
404: ZS_INTERRUPT44C ! 1c = level 12 (zs) interrupt
405: HARDINT44C(13) ! 1d = level 13 interrupt
406: HARDINT44C(14) ! 1e = level 14 interrupt
407: VTRAP(15, nmi_sun4) ! 1f = nonmaskable interrupt
408: UTRAP(0x20)
409: UTRAP(0x21)
410: UTRAP(0x22)
411: UTRAP(0x23)
412: TRAP(T_CPDISABLED) ! 24 = coprocessor instr, EC bit off in psr
413: UTRAP(0x25)
414: UTRAP(0x26)
415: UTRAP(0x27)
416: TRAP(T_CPEXCEPTION) ! 28 = coprocessor exception
417: UTRAP(0x29)
418: UTRAP(0x2a)
419: UTRAP(0x2b)
420: UTRAP(0x2c)
421: UTRAP(0x2d)
422: UTRAP(0x2e)
423: UTRAP(0x2f)
424: UTRAP(0x30)
425: UTRAP(0x31)
426: UTRAP(0x32)
427: UTRAP(0x33)
428: UTRAP(0x34)
429: UTRAP(0x35)
430: UTRAP(0x36)
431: UTRAP(0x37)
432: UTRAP(0x38)
433: UTRAP(0x39)
434: UTRAP(0x3a)
435: UTRAP(0x3b)
436: UTRAP(0x3c)
437: UTRAP(0x3d)
438: UTRAP(0x3e)
439: UTRAP(0x3f)
440: UTRAP(0x40)
441: UTRAP(0x41)
442: UTRAP(0x42)
443: UTRAP(0x43)
444: UTRAP(0x44)
445: UTRAP(0x45)
446: UTRAP(0x46)
447: UTRAP(0x47)
448: UTRAP(0x48)
449: UTRAP(0x49)
450: UTRAP(0x4a)
451: UTRAP(0x4b)
452: UTRAP(0x4c)
453: UTRAP(0x4d)
454: UTRAP(0x4e)
455: UTRAP(0x4f)
456: UTRAP(0x50)
457: UTRAP(0x51)
458: UTRAP(0x52)
459: UTRAP(0x53)
460: UTRAP(0x54)
461: UTRAP(0x55)
462: UTRAP(0x56)
463: UTRAP(0x57)
464: UTRAP(0x58)
465: UTRAP(0x59)
466: UTRAP(0x5a)
467: UTRAP(0x5b)
468: UTRAP(0x5c)
469: UTRAP(0x5d)
470: UTRAP(0x5e)
471: UTRAP(0x5f)
472: UTRAP(0x60)
473: UTRAP(0x61)
474: UTRAP(0x62)
475: UTRAP(0x63)
476: UTRAP(0x64)
477: UTRAP(0x65)
478: UTRAP(0x66)
479: UTRAP(0x67)
480: UTRAP(0x68)
481: UTRAP(0x69)
482: UTRAP(0x6a)
483: UTRAP(0x6b)
484: UTRAP(0x6c)
485: UTRAP(0x6d)
486: UTRAP(0x6e)
487: UTRAP(0x6f)
488: UTRAP(0x70)
489: UTRAP(0x71)
490: UTRAP(0x72)
491: UTRAP(0x73)
492: UTRAP(0x74)
493: UTRAP(0x75)
494: UTRAP(0x76)
495: UTRAP(0x77)
496: UTRAP(0x78)
497: UTRAP(0x79)
498: UTRAP(0x7a)
499: UTRAP(0x7b)
500: UTRAP(0x7c)
501: UTRAP(0x7d)
502: UTRAP(0x7e)
503: UTRAP(0x7f)
504: SYSCALL ! 80 = sun syscall
505: BPT ! 81 = pseudo breakpoint instruction
506: TRAP(T_DIV0) ! 82 = divide by zero
507: TRAP(T_FLUSHWIN) ! 83 = flush windows
508: TRAP(T_CLEANWIN) ! 84 = provide clean windows
509: TRAP(T_RANGECHECK) ! 85 = ???
510: TRAP(T_FIXALIGN) ! 86 = fix up unaligned accesses
511: TRAP(T_INTOF) ! 87 = integer overflow
512: SYSCALL ! 88 = svr4 syscall
513: SYSCALL ! 89 = bsd syscall
514: BPT_KGDB_EXEC ! 8a = enter kernel gdb on kernel startup
515: STRAP(0x8b)
516: STRAP(0x8c)
517: STRAP(0x8d)
518: STRAP(0x8e)
519: STRAP(0x8f)
520: STRAP(0x90)
521: STRAP(0x91)
522: STRAP(0x92)
523: STRAP(0x93)
524: STRAP(0x94)
525: STRAP(0x95)
526: STRAP(0x96)
527: STRAP(0x97)
528: STRAP(0x98)
529: STRAP(0x99)
530: STRAP(0x9a)
531: STRAP(0x9b)
532: STRAP(0x9c)
533: STRAP(0x9d)
534: STRAP(0x9e)
535: STRAP(0x9f)
536: STRAP(0xa0)
537: STRAP(0xa1)
538: STRAP(0xa2)
539: STRAP(0xa3)
540: STRAP(0xa4)
541: STRAP(0xa5)
542: STRAP(0xa6)
543: STRAP(0xa7)
544: STRAP(0xa8)
545: STRAP(0xa9)
546: STRAP(0xaa)
547: STRAP(0xab)
548: STRAP(0xac)
549: STRAP(0xad)
550: STRAP(0xae)
551: STRAP(0xaf)
552: STRAP(0xb0)
553: STRAP(0xb1)
554: STRAP(0xb2)
555: STRAP(0xb3)
556: STRAP(0xb4)
557: STRAP(0xb5)
558: STRAP(0xb6)
559: STRAP(0xb7)
560: STRAP(0xb8)
561: STRAP(0xb9)
562: STRAP(0xba)
563: STRAP(0xbb)
564: STRAP(0xbc)
565: STRAP(0xbd)
566: STRAP(0xbe)
567: STRAP(0xbf)
568: STRAP(0xc0)
569: STRAP(0xc1)
570: STRAP(0xc2)
571: STRAP(0xc3)
572: STRAP(0xc4)
573: STRAP(0xc5)
574: STRAP(0xc6)
575: STRAP(0xc7)
576: STRAP(0xc8)
577: STRAP(0xc9)
578: STRAP(0xca)
579: STRAP(0xcb)
580: STRAP(0xcc)
581: STRAP(0xcd)
582: STRAP(0xce)
583: STRAP(0xcf)
584: STRAP(0xd0)
585: STRAP(0xd1)
586: STRAP(0xd2)
587: STRAP(0xd3)
588: STRAP(0xd4)
589: STRAP(0xd5)
590: STRAP(0xd6)
591: STRAP(0xd7)
592: STRAP(0xd8)
593: STRAP(0xd9)
594: STRAP(0xda)
595: STRAP(0xdb)
596: STRAP(0xdc)
597: STRAP(0xdd)
598: STRAP(0xde)
599: STRAP(0xdf)
600: STRAP(0xe0)
601: STRAP(0xe1)
602: STRAP(0xe2)
603: STRAP(0xe3)
604: STRAP(0xe4)
605: STRAP(0xe5)
606: STRAP(0xe6)
607: STRAP(0xe7)
608: STRAP(0xe8)
609: STRAP(0xe9)
610: STRAP(0xea)
611: STRAP(0xeb)
612: STRAP(0xec)
613: STRAP(0xed)
614: STRAP(0xee)
615: STRAP(0xef)
616: STRAP(0xf0)
617: STRAP(0xf1)
618: STRAP(0xf2)
619: STRAP(0xf3)
620: STRAP(0xf4)
621: STRAP(0xf5)
622: STRAP(0xf6)
623: STRAP(0xf7)
624: STRAP(0xf8)
625: STRAP(0xf9)
626: STRAP(0xfa)
627: STRAP(0xfb)
628: STRAP(0xfc)
629: STRAP(0xfd)
630: STRAP(0xfe)
631: STRAP(0xff)
632: #endif
633:
634: #if defined(SUN4C)
635: trapbase_sun4c:
636: /* trap 0 is special since we cannot receive it */
637: b dostart; nop; nop; nop ! 00 = reset (fake)
638: VTRAP(T_TEXTFAULT, memfault_sun4c) ! 01 = instr. fetch fault
639: TRAP(T_ILLINST) ! 02 = illegal instruction
640: TRAP(T_PRIVINST) ! 03 = privileged instruction
641: TRAP(T_FPDISABLED) ! 04 = fp instr, but EF bit off in psr
642: WINDOW_OF ! 05 = window overflow
643: WINDOW_UF ! 06 = window underflow
644: TRAP(T_ALIGN) ! 07 = address alignment error
645: VTRAP(T_FPE, fp_exception) ! 08 = fp exception
646: VTRAP(T_DATAFAULT, memfault_sun4c) ! 09 = data fetch fault
647: TRAP(T_TAGOF) ! 0a = tag overflow
648: UTRAP(0x0b)
649: UTRAP(0x0c)
650: UTRAP(0x0d)
651: UTRAP(0x0e)
652: UTRAP(0x0f)
653: UTRAP(0x10)
654: SOFTINT44C(1, IE_L1) ! 11 = level 1 interrupt
655: HARDINT44C(2) ! 12 = level 2 interrupt
656: HARDINT44C(3) ! 13 = level 3 interrupt
657: SOFTINT44C(4, IE_L4) ! 14 = level 4 interrupt
658: HARDINT44C(5) ! 15 = level 5 interrupt
659: SOFTINT44C(6, IE_L6) ! 16 = level 6 interrupt
660: HARDINT44C(7) ! 17 = level 7 interrupt
661: HARDINT44C(8) ! 18 = level 8 interrupt
662: HARDINT44C(9) ! 19 = level 9 interrupt
663: HARDINT44C(10) ! 1a = level 10 interrupt
664: HARDINT44C(11) ! 1b = level 11 interrupt
665: ZS_INTERRUPT44C ! 1c = level 12 (zs) interrupt
666: HARDINT44C(13) ! 1d = level 13 interrupt
667: HARDINT44C(14) ! 1e = level 14 interrupt
668: VTRAP(15, nmi_sun4c) ! 1f = nonmaskable interrupt
669: UTRAP(0x20)
670: UTRAP(0x21)
671: UTRAP(0x22)
672: UTRAP(0x23)
673: TRAP(T_CPDISABLED) ! 24 = coprocessor instr, EC bit off in psr
674: UTRAP(0x25)
675: UTRAP(0x26)
676: UTRAP(0x27)
677: TRAP(T_CPEXCEPTION) ! 28 = coprocessor exception
678: UTRAP(0x29)
679: UTRAP(0x2a)
680: UTRAP(0x2b)
681: UTRAP(0x2c)
682: UTRAP(0x2d)
683: UTRAP(0x2e)
684: UTRAP(0x2f)
685: UTRAP(0x30)
686: UTRAP(0x31)
687: UTRAP(0x32)
688: UTRAP(0x33)
689: UTRAP(0x34)
690: UTRAP(0x35)
691: UTRAP(0x36)
692: UTRAP(0x37)
693: UTRAP(0x38)
694: UTRAP(0x39)
695: UTRAP(0x3a)
696: UTRAP(0x3b)
697: UTRAP(0x3c)
698: UTRAP(0x3d)
699: UTRAP(0x3e)
700: UTRAP(0x3f)
701: UTRAP(0x40)
702: UTRAP(0x41)
703: UTRAP(0x42)
704: UTRAP(0x43)
705: UTRAP(0x44)
706: UTRAP(0x45)
707: UTRAP(0x46)
708: UTRAP(0x47)
709: UTRAP(0x48)
710: UTRAP(0x49)
711: UTRAP(0x4a)
712: UTRAP(0x4b)
713: UTRAP(0x4c)
714: UTRAP(0x4d)
715: UTRAP(0x4e)
716: UTRAP(0x4f)
717: UTRAP(0x50)
718: UTRAP(0x51)
719: UTRAP(0x52)
720: UTRAP(0x53)
721: UTRAP(0x54)
722: UTRAP(0x55)
723: UTRAP(0x56)
724: UTRAP(0x57)
725: UTRAP(0x58)
726: UTRAP(0x59)
727: UTRAP(0x5a)
728: UTRAP(0x5b)
729: UTRAP(0x5c)
730: UTRAP(0x5d)
731: UTRAP(0x5e)
732: UTRAP(0x5f)
733: UTRAP(0x60)
734: UTRAP(0x61)
735: UTRAP(0x62)
736: UTRAP(0x63)
737: UTRAP(0x64)
738: UTRAP(0x65)
739: UTRAP(0x66)
740: UTRAP(0x67)
741: UTRAP(0x68)
742: UTRAP(0x69)
743: UTRAP(0x6a)
744: UTRAP(0x6b)
745: UTRAP(0x6c)
746: UTRAP(0x6d)
747: UTRAP(0x6e)
748: UTRAP(0x6f)
749: UTRAP(0x70)
750: UTRAP(0x71)
751: UTRAP(0x72)
752: UTRAP(0x73)
753: UTRAP(0x74)
754: UTRAP(0x75)
755: UTRAP(0x76)
756: UTRAP(0x77)
757: UTRAP(0x78)
758: UTRAP(0x79)
759: UTRAP(0x7a)
760: UTRAP(0x7b)
761: UTRAP(0x7c)
762: UTRAP(0x7d)
763: UTRAP(0x7e)
764: UTRAP(0x7f)
765: SYSCALL ! 80 = sun syscall
766: BPT ! 81 = pseudo breakpoint instruction
767: TRAP(T_DIV0) ! 82 = divide by zero
768: TRAP(T_FLUSHWIN) ! 83 = flush windows
769: TRAP(T_CLEANWIN) ! 84 = provide clean windows
770: TRAP(T_RANGECHECK) ! 85 = ???
771: TRAP(T_FIXALIGN) ! 86 = fix up unaligned accesses
772: TRAP(T_INTOF) ! 87 = integer overflow
773: SYSCALL ! 88 = svr4 syscall
774: SYSCALL ! 89 = bsd syscall
775: BPT_KGDB_EXEC ! 8a = enter kernel gdb on kernel startup
776: STRAP(0x8b)
777: STRAP(0x8c)
778: STRAP(0x8d)
779: STRAP(0x8e)
780: STRAP(0x8f)
781: STRAP(0x90)
782: STRAP(0x91)
783: STRAP(0x92)
784: STRAP(0x93)
785: STRAP(0x94)
786: STRAP(0x95)
787: STRAP(0x96)
788: STRAP(0x97)
789: STRAP(0x98)
790: STRAP(0x99)
791: STRAP(0x9a)
792: STRAP(0x9b)
793: STRAP(0x9c)
794: STRAP(0x9d)
795: STRAP(0x9e)
796: STRAP(0x9f)
797: STRAP(0xa0)
798: STRAP(0xa1)
799: STRAP(0xa2)
800: STRAP(0xa3)
801: STRAP(0xa4)
802: STRAP(0xa5)
803: STRAP(0xa6)
804: STRAP(0xa7)
805: STRAP(0xa8)
806: STRAP(0xa9)
807: STRAP(0xaa)
808: STRAP(0xab)
809: STRAP(0xac)
810: STRAP(0xad)
811: STRAP(0xae)
812: STRAP(0xaf)
813: STRAP(0xb0)
814: STRAP(0xb1)
815: STRAP(0xb2)
816: STRAP(0xb3)
817: STRAP(0xb4)
818: STRAP(0xb5)
819: STRAP(0xb6)
820: STRAP(0xb7)
821: STRAP(0xb8)
822: STRAP(0xb9)
823: STRAP(0xba)
824: STRAP(0xbb)
825: STRAP(0xbc)
826: STRAP(0xbd)
827: STRAP(0xbe)
828: STRAP(0xbf)
829: STRAP(0xc0)
830: STRAP(0xc1)
831: STRAP(0xc2)
832: STRAP(0xc3)
833: STRAP(0xc4)
834: STRAP(0xc5)
835: STRAP(0xc6)
836: STRAP(0xc7)
837: STRAP(0xc8)
838: STRAP(0xc9)
839: STRAP(0xca)
840: STRAP(0xcb)
841: STRAP(0xcc)
842: STRAP(0xcd)
843: STRAP(0xce)
844: STRAP(0xcf)
845: STRAP(0xd0)
846: STRAP(0xd1)
847: STRAP(0xd2)
848: STRAP(0xd3)
849: STRAP(0xd4)
850: STRAP(0xd5)
851: STRAP(0xd6)
852: STRAP(0xd7)
853: STRAP(0xd8)
854: STRAP(0xd9)
855: STRAP(0xda)
856: STRAP(0xdb)
857: STRAP(0xdc)
858: STRAP(0xdd)
859: STRAP(0xde)
860: STRAP(0xdf)
861: STRAP(0xe0)
862: STRAP(0xe1)
863: STRAP(0xe2)
864: STRAP(0xe3)
865: STRAP(0xe4)
866: STRAP(0xe5)
867: STRAP(0xe6)
868: STRAP(0xe7)
869: STRAP(0xe8)
870: STRAP(0xe9)
871: STRAP(0xea)
872: STRAP(0xeb)
873: STRAP(0xec)
874: STRAP(0xed)
875: STRAP(0xee)
876: STRAP(0xef)
877: STRAP(0xf0)
878: STRAP(0xf1)
879: STRAP(0xf2)
880: STRAP(0xf3)
881: STRAP(0xf4)
882: STRAP(0xf5)
883: STRAP(0xf6)
884: STRAP(0xf7)
885: STRAP(0xf8)
886: STRAP(0xf9)
887: STRAP(0xfa)
888: STRAP(0xfb)
889: STRAP(0xfc)
890: STRAP(0xfd)
891: STRAP(0xfe)
892: STRAP(0xff)
1.1 deraadt 893: #endif
894:
1.52 pk 895: #if defined(SUN4M)
896: trapbase_sun4m:
1.1 deraadt 897: /* trap 0 is special since we cannot receive it */
898: b dostart; nop; nop; nop ! 00 = reset (fake)
1.52 pk 899: VTRAP(T_TEXTFAULT, memfault_sun4m) ! 01 = instr. fetch fault
1.1 deraadt 900: TRAP(T_ILLINST) ! 02 = illegal instruction
901: TRAP(T_PRIVINST) ! 03 = privileged instruction
902: TRAP(T_FPDISABLED) ! 04 = fp instr, but EF bit off in psr
903: WINDOW_OF ! 05 = window overflow
904: WINDOW_UF ! 06 = window underflow
905: TRAP(T_ALIGN) ! 07 = address alignment error
906: VTRAP(T_FPE, fp_exception) ! 08 = fp exception
1.52 pk 907: VTRAP(T_DATAFAULT, memfault_sun4m) ! 09 = data fetch fault
1.1 deraadt 908: TRAP(T_TAGOF) ! 0a = tag overflow
909: UTRAP(0x0b)
910: UTRAP(0x0c)
911: UTRAP(0x0d)
912: UTRAP(0x0e)
913: UTRAP(0x0f)
914: UTRAP(0x10)
1.52 pk 915: HARDINT4M(1) ! 11 = level 1 interrupt
916: HARDINT4M(2) ! 12 = level 2 interrupt
917: HARDINT4M(3) ! 13 = level 3 interrupt
918: HARDINT4M(4) ! 14 = level 4 interrupt
919: HARDINT4M(5) ! 15 = level 5 interrupt
920: HARDINT4M(6) ! 16 = level 6 interrupt
921: HARDINT4M(7) ! 17 = level 7 interrupt
922: HARDINT4M(8) ! 18 = level 8 interrupt
923: HARDINT4M(9) ! 19 = level 9 interrupt
924: HARDINT4M(10) ! 1a = level 10 interrupt
925: HARDINT4M(11) ! 1b = level 11 interrupt
926: ZS_INTERRUPT4M ! 1c = level 12 (zs) interrupt
927: HARDINT4M(13) ! 1d = level 13 interrupt
928: HARDINT4M(14) ! 1e = level 14 interrupt
929: VTRAP(15, nmi_sun4m) ! 1f = nonmaskable interrupt
1.1 deraadt 930: UTRAP(0x20)
931: UTRAP(0x21)
932: UTRAP(0x22)
933: UTRAP(0x23)
1.25 deraadt 934: TRAP(T_CPDISABLED) ! 24 = coprocessor instr, EC bit off in psr
1.1 deraadt 935: UTRAP(0x25)
936: UTRAP(0x26)
937: UTRAP(0x27)
1.25 deraadt 938: TRAP(T_CPEXCEPTION) ! 28 = coprocessor exception
1.1 deraadt 939: UTRAP(0x29)
940: UTRAP(0x2a)
1.52 pk 941: VTRAP(T_STOREBUFFAULT, memfault_sun4m) ! 2b = SuperSPARC store buffer fault
1.1 deraadt 942: UTRAP(0x2c)
943: UTRAP(0x2d)
944: UTRAP(0x2e)
945: UTRAP(0x2f)
946: UTRAP(0x30)
947: UTRAP(0x31)
948: UTRAP(0x32)
949: UTRAP(0x33)
950: UTRAP(0x34)
951: UTRAP(0x35)
1.25 deraadt 952: UTRAP(0x36)
1.1 deraadt 953: UTRAP(0x37)
954: UTRAP(0x38)
955: UTRAP(0x39)
956: UTRAP(0x3a)
957: UTRAP(0x3b)
958: UTRAP(0x3c)
959: UTRAP(0x3d)
960: UTRAP(0x3e)
961: UTRAP(0x3f)
1.25 deraadt 962: UTRAP(0x40)
1.1 deraadt 963: UTRAP(0x41)
964: UTRAP(0x42)
965: UTRAP(0x43)
966: UTRAP(0x44)
967: UTRAP(0x45)
968: UTRAP(0x46)
969: UTRAP(0x47)
970: UTRAP(0x48)
971: UTRAP(0x49)
972: UTRAP(0x4a)
973: UTRAP(0x4b)
974: UTRAP(0x4c)
975: UTRAP(0x4d)
976: UTRAP(0x4e)
977: UTRAP(0x4f)
978: UTRAP(0x50)
979: UTRAP(0x51)
980: UTRAP(0x52)
981: UTRAP(0x53)
982: UTRAP(0x54)
983: UTRAP(0x55)
984: UTRAP(0x56)
985: UTRAP(0x57)
986: UTRAP(0x58)
987: UTRAP(0x59)
988: UTRAP(0x5a)
989: UTRAP(0x5b)
990: UTRAP(0x5c)
991: UTRAP(0x5d)
992: UTRAP(0x5e)
993: UTRAP(0x5f)
994: UTRAP(0x60)
995: UTRAP(0x61)
996: UTRAP(0x62)
997: UTRAP(0x63)
998: UTRAP(0x64)
999: UTRAP(0x65)
1000: UTRAP(0x66)
1001: UTRAP(0x67)
1002: UTRAP(0x68)
1003: UTRAP(0x69)
1004: UTRAP(0x6a)
1005: UTRAP(0x6b)
1006: UTRAP(0x6c)
1007: UTRAP(0x6d)
1008: UTRAP(0x6e)
1009: UTRAP(0x6f)
1010: UTRAP(0x70)
1011: UTRAP(0x71)
1012: UTRAP(0x72)
1013: UTRAP(0x73)
1014: UTRAP(0x74)
1015: UTRAP(0x75)
1016: UTRAP(0x76)
1017: UTRAP(0x77)
1018: UTRAP(0x78)
1019: UTRAP(0x79)
1020: UTRAP(0x7a)
1021: UTRAP(0x7b)
1022: UTRAP(0x7c)
1023: UTRAP(0x7d)
1024: UTRAP(0x7e)
1025: UTRAP(0x7f)
1.3 deraadt 1026: SYSCALL ! 80 = sun syscall
1.1 deraadt 1027: BPT ! 81 = pseudo breakpoint instruction
1028: TRAP(T_DIV0) ! 82 = divide by zero
1029: TRAP(T_FLUSHWIN) ! 83 = flush windows
1030: TRAP(T_CLEANWIN) ! 84 = provide clean windows
1031: TRAP(T_RANGECHECK) ! 85 = ???
1032: TRAP(T_FIXALIGN) ! 86 = fix up unaligned accesses
1033: TRAP(T_INTOF) ! 87 = integer overflow
1.33 christos 1034: SYSCALL ! 88 = svr4 syscall
1.1 deraadt 1035: SYSCALL ! 89 = bsd syscall
1.33 christos 1036: BPT_KGDB_EXEC ! 8a = enter kernel gdb on kernel startup
1.1 deraadt 1037: STRAP(0x8b)
1038: STRAP(0x8c)
1039: STRAP(0x8d)
1040: STRAP(0x8e)
1041: STRAP(0x8f)
1042: STRAP(0x90)
1043: STRAP(0x91)
1044: STRAP(0x92)
1045: STRAP(0x93)
1046: STRAP(0x94)
1047: STRAP(0x95)
1048: STRAP(0x96)
1049: STRAP(0x97)
1050: STRAP(0x98)
1051: STRAP(0x99)
1052: STRAP(0x9a)
1053: STRAP(0x9b)
1054: STRAP(0x9c)
1055: STRAP(0x9d)
1056: STRAP(0x9e)
1057: STRAP(0x9f)
1058: STRAP(0xa0)
1059: STRAP(0xa1)
1060: STRAP(0xa2)
1061: STRAP(0xa3)
1062: STRAP(0xa4)
1063: STRAP(0xa5)
1064: STRAP(0xa6)
1065: STRAP(0xa7)
1066: STRAP(0xa8)
1067: STRAP(0xa9)
1068: STRAP(0xaa)
1069: STRAP(0xab)
1070: STRAP(0xac)
1071: STRAP(0xad)
1072: STRAP(0xae)
1073: STRAP(0xaf)
1074: STRAP(0xb0)
1075: STRAP(0xb1)
1076: STRAP(0xb2)
1077: STRAP(0xb3)
1078: STRAP(0xb4)
1079: STRAP(0xb5)
1080: STRAP(0xb6)
1081: STRAP(0xb7)
1082: STRAP(0xb8)
1083: STRAP(0xb9)
1084: STRAP(0xba)
1085: STRAP(0xbb)
1086: STRAP(0xbc)
1087: STRAP(0xbd)
1088: STRAP(0xbe)
1089: STRAP(0xbf)
1090: STRAP(0xc0)
1091: STRAP(0xc1)
1092: STRAP(0xc2)
1093: STRAP(0xc3)
1094: STRAP(0xc4)
1095: STRAP(0xc5)
1096: STRAP(0xc6)
1097: STRAP(0xc7)
1098: STRAP(0xc8)
1099: STRAP(0xc9)
1100: STRAP(0xca)
1101: STRAP(0xcb)
1102: STRAP(0xcc)
1103: STRAP(0xcd)
1104: STRAP(0xce)
1105: STRAP(0xcf)
1106: STRAP(0xd0)
1107: STRAP(0xd1)
1108: STRAP(0xd2)
1109: STRAP(0xd3)
1110: STRAP(0xd4)
1111: STRAP(0xd5)
1112: STRAP(0xd6)
1113: STRAP(0xd7)
1114: STRAP(0xd8)
1115: STRAP(0xd9)
1116: STRAP(0xda)
1117: STRAP(0xdb)
1118: STRAP(0xdc)
1119: STRAP(0xdd)
1120: STRAP(0xde)
1121: STRAP(0xdf)
1122: STRAP(0xe0)
1123: STRAP(0xe1)
1124: STRAP(0xe2)
1125: STRAP(0xe3)
1126: STRAP(0xe4)
1127: STRAP(0xe5)
1128: STRAP(0xe6)
1129: STRAP(0xe7)
1130: STRAP(0xe8)
1131: STRAP(0xe9)
1132: STRAP(0xea)
1133: STRAP(0xeb)
1134: STRAP(0xec)
1135: STRAP(0xed)
1136: STRAP(0xee)
1137: STRAP(0xef)
1138: STRAP(0xf0)
1139: STRAP(0xf1)
1140: STRAP(0xf2)
1141: STRAP(0xf3)
1142: STRAP(0xf4)
1143: STRAP(0xf5)
1144: STRAP(0xf6)
1145: STRAP(0xf7)
1146: STRAP(0xf8)
1147: STRAP(0xf9)
1148: STRAP(0xfa)
1149: STRAP(0xfb)
1150: STRAP(0xfc)
1151: STRAP(0xfd)
1152: STRAP(0xfe)
1153: STRAP(0xff)
1.52 pk 1154: #endif
1.1 deraadt 1155:
1.20 deraadt 1156: /*
1.52 pk 1157: * Pad the trap table to max page size.
1158: * Trap table size is 0x100 * 4instr * 4byte/instr = 4096 bytes;
1159: * need to .skip 4096 to pad to page size iff. the number of trap tables
1160: * defined above is odd.
1.20 deraadt 1161: */
1.65 mycroft 1162: #if (defined(SUN4) + defined(SUN4C) + defined(SUN4M)) % 2 == 1
1.20 deraadt 1163: .skip 4096
1.52 pk 1164: #endif
1.20 deraadt 1165:
1.98 pk 1166: #ifdef DEBUG
1.1 deraadt 1167: /*
1168: * A hardware red zone is impossible. We simulate one in software by
1169: * keeping a `red zone' pointer; if %sp becomes less than this, we panic.
1170: * This is expensive and is only enabled when debugging.
1171: */
1.97 pk 1172:
1.99 pk 1173: /* `redzone' is located in the per-CPU information structure */
1.97 pk 1174: _redzone = CPUINFO_VA + CPUINFO_REDZONE
1175: .data
1.1 deraadt 1176: #define REDSTACK 2048 /* size of `panic: stack overflow' region */
1177: _redstack:
1178: .skip REDSTACK
1179: .text
1180: Lpanic_red:
1181: .asciz "stack overflow"
1.52 pk 1182: _ALIGN
1.1 deraadt 1183:
1184: /* set stack pointer redzone to base+minstack; alters base */
1185: #define SET_SP_REDZONE(base, tmp) \
1186: add base, REDSIZE, base; \
1187: sethi %hi(_redzone), tmp; \
1188: st base, [tmp + %lo(_redzone)]
1189:
1190: /* variant with a constant */
1191: #define SET_SP_REDZONE_CONST(const, tmp1, tmp2) \
1192: set (const) + REDSIZE, tmp1; \
1193: sethi %hi(_redzone), tmp2; \
1194: st tmp1, [tmp2 + %lo(_redzone)]
1195:
1.97 pk 1196: /* variant with a variable & offset */
1197: #define SET_SP_REDZONE_VAR(var, offset, tmp1, tmp2) \
1198: sethi %hi(var), tmp1; \
1199: ld [tmp1 + %lo(var)], tmp1; \
1200: sethi %hi(offset), tmp2; \
1201: add tmp1, tmp2, tmp1; \
1202: SET_SP_REDZONE(tmp1, tmp2)
1203:
1.1 deraadt 1204: /* check stack pointer against redzone (uses two temps) */
1205: #define CHECK_SP_REDZONE(t1, t2) \
1206: sethi %hi(_redzone), t1; \
1207: ld [t1 + %lo(_redzone)], t2; \
1208: cmp %sp, t2; /* if sp >= t2, not in red zone */ \
1209: bgeu 7f; nop; /* and can continue normally */ \
1210: /* move to panic stack */ \
1211: st %g0, [t1 + %lo(_redzone)]; \
1212: set _redstack + REDSTACK - 96, %sp; \
1213: /* prevent panic() from lowering ipl */ \
1.121 christos 1214: sethi %hi(_C_LABEL(panicstr)), t2; \
1.1 deraadt 1215: set Lpanic_red, t2; \
1.121 christos 1216: st t2, [t1 + %lo(_C_LABEL(panicstr))]; \
1.1 deraadt 1217: rd %psr, t1; /* t1 = splhigh() */ \
1218: or t1, PSR_PIL, t2; \
1219: wr t2, 0, %psr; \
1220: wr t2, PSR_ET, %psr; /* turn on traps */ \
1221: nop; nop; nop; \
1.4 deraadt 1222: save %sp, -CCFSZ, %sp; /* preserve current window */ \
1.1 deraadt 1223: sethi %hi(Lpanic_red), %o0; \
1.121 christos 1224: call _C_LABEL(panic); or %o0, %lo(Lpanic_red), %o0; \
1.1 deraadt 1225: 7:
1226:
1227: #else
1228:
1229: #define SET_SP_REDZONE(base, tmp)
1230: #define SET_SP_REDZONE_CONST(const, t1, t2)
1.98 pk 1231: #define SET_SP_REDZONE_VAR(var, offset, t1, t2)
1.1 deraadt 1232: #define CHECK_SP_REDZONE(t1, t2)
1.97 pk 1233: #endif /* DEBUG */
1.1 deraadt 1234:
1235: /*
1236: * The window code must verify user stack addresses before using them.
1237: * A user stack pointer is invalid if:
1238: * - it is not on an 8 byte boundary;
1239: * - its pages (a register window, being 64 bytes, can occupy
1240: * two pages) are not readable or writable.
1241: * We define three separate macros here for testing user stack addresses.
1242: *
1243: * PTE_OF_ADDR locates a PTE, branching to a `bad address'
1244: * handler if the stack pointer points into the hole in the
1245: * address space (i.e., top 3 bits are not either all 1 or all 0);
1246: * CMP_PTE_USER_READ compares the located PTE against `user read' mode;
1247: * CMP_PTE_USER_WRITE compares the located PTE against `user write' mode.
1248: * The compares give `equal' if read or write is OK.
1249: *
1250: * Note that the user stack pointer usually points into high addresses
1251: * (top 3 bits all 1), so that is what we check first.
1252: *
1253: * The code below also assumes that PTE_OF_ADDR is safe in a delay
1254: * slot; it is, at it merely sets its `pte' register to a temporary value.
1255: */
1.52 pk 1256: #if defined(SUN4) || defined(SUN4C)
1.1 deraadt 1257: /* input: addr, output: pte; aux: bad address label */
1.52 pk 1258: #define PTE_OF_ADDR4_4C(addr, pte, bad, page_offset) \
1.1 deraadt 1259: sra addr, PG_VSHIFT, pte; \
1260: cmp pte, -1; \
1.13 deraadt 1261: be,a 1f; andn addr, page_offset, pte; \
1.1 deraadt 1262: tst pte; \
1263: bne bad; EMPTY; \
1.13 deraadt 1264: andn addr, page_offset, pte; \
1.1 deraadt 1265: 1:
1266:
1267: /* input: pte; output: condition codes */
1.52 pk 1268: #define CMP_PTE_USER_READ4_4C(pte) \
1.1 deraadt 1269: lda [pte] ASI_PTE, pte; \
1270: srl pte, PG_PROTSHIFT, pte; \
1271: andn pte, (PG_W >> PG_PROTSHIFT), pte; \
1272: cmp pte, PG_PROTUREAD
1273:
1274: /* input: pte; output: condition codes */
1.52 pk 1275: #define CMP_PTE_USER_WRITE4_4C(pte) \
1.1 deraadt 1276: lda [pte] ASI_PTE, pte; \
1277: srl pte, PG_PROTSHIFT, pte; \
1278: cmp pte, PG_PROTUWRITE
1.9 deraadt 1279: #endif
1.1 deraadt 1280:
1281: /*
1.52 pk 1282: * The Sun4M does not have the memory hole that the 4C does. Thus all
1283: * we need to do here is clear the page offset from addr.
1284: */
1285: #if defined(SUN4M)
1286: #define PTE_OF_ADDR4M(addr, pte, bad, page_offset) \
1287: andn addr, page_offset, pte
1288:
1.94 pk 1289: /*
1290: * After obtaining the PTE through ASI_SRMMUFP, we read the Sync Fault
1291: * Status register. This is necessary on Hypersparcs which stores and
1292: * locks the fault address and status registers if the translation
1293: * fails (thanks to Chris Torek for finding this quirk).
1294: */
1.59 pk 1295: /* note: pmap currently does not use the PPROT_R_R and PPROT_RW_RW cases */
1.94 pk 1296: #define CMP_PTE_USER_READ4M(pte, tmp) \
1.52 pk 1297: or pte, ASI_SRMMUFP_L3, pte; \
1298: lda [pte] ASI_SRMMUFP, pte; \
1.94 pk 1299: set SRMMU_SFSR, tmp; \
1.58 pk 1300: and pte, (SRMMU_TETYPE | SRMMU_PROT_MASK), pte; \
1.59 pk 1301: cmp pte, (SRMMU_TEPTE | PPROT_RWX_RWX); \
1.94 pk 1302: be 8f; \
1303: lda [tmp] ASI_SRMMU, %g0; \
1.59 pk 1304: cmp pte, (SRMMU_TEPTE | PPROT_RX_RX); \
1305: 8:
1.52 pk 1306:
1.58 pk 1307:
1308: /* note: PTE bit 4 set implies no user writes */
1.94 pk 1309: #define CMP_PTE_USER_WRITE4M(pte, tmp) \
1.52 pk 1310: or pte, ASI_SRMMUFP_L3, pte; \
1311: lda [pte] ASI_SRMMUFP, pte; \
1.94 pk 1312: set SRMMU_SFSR, tmp; \
1313: lda [tmp] ASI_SRMMU, %g0; \
1.58 pk 1314: and pte, (SRMMU_TETYPE | 0x14), pte; \
1315: cmp pte, (SRMMU_TEPTE | PPROT_WRITE)
1.52 pk 1316: #endif /* 4m */
1317:
1318: #if defined(SUN4M) && !(defined(SUN4C) || defined(SUN4))
1.64 pk 1319:
1.62 pk 1320: #define PTE_OF_ADDR(addr, pte, bad, page_offset, label) \
1321: PTE_OF_ADDR4M(addr, pte, bad, page_offset)
1.94 pk 1322: #define CMP_PTE_USER_WRITE(pte, tmp, label) CMP_PTE_USER_WRITE4M(pte,tmp)
1323: #define CMP_PTE_USER_READ(pte, tmp, label) CMP_PTE_USER_READ4M(pte,tmp)
1.64 pk 1324:
1.52 pk 1325: #elif (defined(SUN4C) || defined(SUN4)) && !defined(SUN4M)
1.64 pk 1326:
1.62 pk 1327: #define PTE_OF_ADDR(addr, pte, bad, page_offset,label) \
1328: PTE_OF_ADDR4_4C(addr, pte, bad, page_offset)
1329: #define CMP_PTE_USER_WRITE(pte, tmp, label) CMP_PTE_USER_WRITE4_4C(pte)
1330: #define CMP_PTE_USER_READ(pte, tmp, label) CMP_PTE_USER_READ4_4C(pte)
1.64 pk 1331:
1.52 pk 1332: #else /* both defined, ugh */
1.64 pk 1333:
1.62 pk 1334: #define PTE_OF_ADDR(addr, pte, bad, page_offset, label) \
1335: label: b,a 2f; \
1336: PTE_OF_ADDR4M(addr, pte, bad, page_offset); \
1337: b,a 3f; \
1338: 2: \
1339: PTE_OF_ADDR4_4C(addr, pte, bad, page_offset); \
1340: 3:
1.52 pk 1341:
1.62 pk 1342: #define CMP_PTE_USER_READ(pte, tmp, label) \
1343: label: b,a 1f; \
1.94 pk 1344: CMP_PTE_USER_READ4M(pte,tmp); \
1.62 pk 1345: b,a 2f; \
1346: 1: \
1347: CMP_PTE_USER_READ4_4C(pte); \
1348: 2:
1.52 pk 1349:
1.62 pk 1350: #define CMP_PTE_USER_WRITE(pte, tmp, label) \
1351: label: b,a 1f; \
1.94 pk 1352: CMP_PTE_USER_WRITE4M(pte,tmp); \
1.62 pk 1353: b,a 2f; \
1354: 1: \
1355: CMP_PTE_USER_WRITE4_4C(pte); \
1356: 2:
1.52 pk 1357: #endif
1358:
1359:
1360: /*
1.1 deraadt 1361: * The calculations in PTE_OF_ADDR and CMP_PTE_USER_* are rather slow:
1362: * in particular, according to Gordon Irlam of the University of Adelaide
1363: * in Australia, these consume at least 18 cycles on an SS1 and 37 on an
1364: * SS2. Hence, we try to avoid them in the common case.
1365: *
1366: * A chunk of 64 bytes is on a single page if and only if:
1367: *
1.13 deraadt 1368: * ((base + 64 - 1) & ~(NBPG-1)) == (base & ~(NBPG-1))
1.1 deraadt 1369: *
1370: * Equivalently (and faster to test), the low order bits (base & 4095) must
1371: * be small enough so that the sum (base + 63) does not carry out into the
1372: * upper page-address bits, i.e.,
1373: *
1.13 deraadt 1374: * (base & (NBPG-1)) < (NBPG - 63)
1.1 deraadt 1375: *
1376: * so we allow testing that here. This macro is also assumed to be safe
1377: * in a delay slot (modulo overwriting its temporary).
1378: */
1.13 deraadt 1379: #define SLT_IF_1PAGE_RW(addr, tmp, page_offset) \
1380: and addr, page_offset, tmp; \
1381: sub page_offset, 62, page_offset; \
1382: cmp tmp, page_offset
1.1 deraadt 1383:
1384: /*
1385: * Every trap that enables traps must set up stack space.
1386: * If the trap is from user mode, this involves switching to the kernel
1387: * stack for the current process, and we must also set cpcb->pcb_uw
1388: * so that the window overflow handler can tell user windows from kernel
1389: * windows.
1390: *
1391: * The number of user windows is:
1392: *
1393: * cpcb->pcb_uw = (cpcb->pcb_wim - 1 - CWP) % nwindows
1394: *
1395: * (where pcb_wim = log2(current %wim) and CWP = low 5 bits of %psr).
1396: * We compute this expression by table lookup in uwtab[CWP - pcb_wim],
1397: * which has been set up as:
1398: *
1399: * for i in [-nwin+1 .. nwin-1]
1400: * uwtab[i] = (nwin - 1 - i) % nwin;
1401: *
1402: * (If you do not believe this works, try it for yourself.)
1403: *
1404: * We also keep one or two more tables:
1405: *
1406: * for i in 0..nwin-1
1407: * wmask[i] = 1 << ((i + 1) % nwindows);
1408: *
1409: * wmask[CWP] tells whether a `rett' would return into the invalid window.
1410: */
1411: .data
1412: .skip 32 ! alignment byte & negative indicies
1413: uwtab: .skip 32 ! u_char uwtab[-31..31];
1414: wmask: .skip 32 ! u_char wmask[0..31];
1415:
1416: .text
1417: /*
1418: * Things begin to grow uglier....
1419: *
1420: * Each trap handler may (always) be running in the trap window.
1421: * If this is the case, it cannot enable further traps until it writes
1422: * the register windows into the stack (or, if the stack is no good,
1423: * the current pcb).
1424: *
1425: * ASSUMPTIONS: TRAP_SETUP() is called with:
1426: * %l0 = %psr
1427: * %l1 = return pc
1428: * %l2 = return npc
1429: * %l3 = (some value that must not be altered)
1430: * which means we have 4 registers to work with.
1431: *
1432: * The `stackspace' argument is the number of stack bytes to allocate
1433: * for register-saving, and must be at least -64 (and typically more,
1434: * for global registers and %y).
1435: *
1436: * Trapframes should use -CCFSZ-80. (80 = sizeof(struct trapframe);
1437: * see trap.h. This basically means EVERYONE. Interrupt frames could
1438: * get away with less, but currently do not.)
1439: *
1440: * The basic outline here is:
1441: *
1442: * if (trap came from kernel mode) {
1443: * if (we are in the trap window)
1444: * save it away;
1445: * %sp = %fp - stackspace;
1446: * } else {
1447: * compute the number of user windows;
1448: * if (we are in the trap window)
1449: * save it away;
1450: * %sp = (top of kernel stack) - stackspace;
1451: * }
1452: *
1453: * Again, the number of user windows is:
1454: *
1455: * cpcb->pcb_uw = (cpcb->pcb_wim - 1 - CWP) % nwindows
1456: *
1457: * (where pcb_wim = log2(current %wim) and CWP is the low 5 bits of %psr),
1458: * and this is computed as `uwtab[CWP - pcb_wim]'.
1459: *
1460: * NOTE: if you change this code, you will have to look carefully
1461: * at the window overflow and underflow handlers and make sure they
1462: * have similar changes made as needed.
1463: */
1464: #define CALL_CLEAN_TRAP_WINDOW \
1465: sethi %hi(clean_trap_window), %l7; \
1466: jmpl %l7 + %lo(clean_trap_window), %l4; \
1467: mov %g7, %l7 /* save %g7 in %l7 for clean_trap_window */
1468:
1469: #define TRAP_SETUP(stackspace) \
1470: rd %wim, %l4; \
1471: mov 1, %l5; \
1472: sll %l5, %l0, %l5; \
1473: btst PSR_PS, %l0; \
1474: bz 1f; \
1475: btst %l5, %l4; \
1476: /* came from kernel mode; cond codes indicate trap window */ \
1477: bz,a 3f; \
1478: add %fp, stackspace, %sp; /* want to just set %sp */ \
1479: CALL_CLEAN_TRAP_WINDOW; /* but maybe need to clean first */ \
1480: b 3f; \
1481: add %fp, stackspace, %sp; \
1482: 1: \
1483: /* came from user mode: compute pcb_nw */ \
1.111 pk 1484: sethi %hi(cpcb), %l6; \
1485: ld [%l6 + %lo(cpcb)], %l6; \
1.1 deraadt 1486: ld [%l6 + PCB_WIM], %l5; \
1487: and %l0, 31, %l4; \
1488: sub %l4, %l5, %l5; \
1489: set uwtab, %l4; \
1490: ldub [%l4 + %l5], %l5; \
1491: st %l5, [%l6 + PCB_UW]; \
1492: /* cond codes still indicate whether in trap window */ \
1493: bz,a 2f; \
1.13 deraadt 1494: sethi %hi(USPACE+(stackspace)), %l5; \
1.1 deraadt 1495: /* yes, in trap window; must clean it */ \
1496: CALL_CLEAN_TRAP_WINDOW; \
1.111 pk 1497: sethi %hi(cpcb), %l6; \
1498: ld [%l6 + %lo(cpcb)], %l6; \
1.13 deraadt 1499: sethi %hi(USPACE+(stackspace)), %l5; \
1.1 deraadt 1500: 2: \
1501: /* trap window is (now) clean: set %sp */ \
1.13 deraadt 1502: or %l5, %lo(USPACE+(stackspace)), %l5; \
1.1 deraadt 1503: add %l6, %l5, %sp; \
1504: SET_SP_REDZONE(%l6, %l5); \
1505: 3: \
1506: CHECK_SP_REDZONE(%l6, %l5)
1507:
1508: /*
1509: * Interrupt setup is almost exactly like trap setup, but we need to
1510: * go to the interrupt stack if (a) we came from user mode or (b) we
1511: * came from kernel mode on the kernel stack.
1512: */
1.97 pk 1513: #ifdef MULTIPROCESSOR
1.98 pk 1514: /*
1515: * SMP kernels: read `eintstack' from cpuinfo structure. Since the
1516: * location of the interrupt stack is not known in advance, we need
1517: * to check the current %fp against both ends of the stack space.
1518: */
1.97 pk 1519: #define INTR_SETUP(stackspace) \
1520: rd %wim, %l4; \
1521: mov 1, %l5; \
1522: sll %l5, %l0, %l5; \
1523: btst PSR_PS, %l0; \
1524: bz 1f; \
1525: btst %l5, %l4; \
1526: /* came from kernel mode; cond codes still indicate trap window */ \
1527: bz,a 0f; \
1.101 pk 1528: sethi %hi(_EINTSTACKP), %l7; \
1.97 pk 1529: CALL_CLEAN_TRAP_WINDOW; \
1.101 pk 1530: sethi %hi(_EINTSTACKP), %l7; \
1.97 pk 1531: 0: /* now if not intstack > %fp >= eintstack, we were on the kernel stack */ \
1.101 pk 1532: ld [%l7 + %lo(_EINTSTACKP)], %l7; \
1.97 pk 1533: cmp %fp, %l7; \
1534: bge,a 3f; /* %fp >= eintstack */ \
1535: add %l7, stackspace, %sp; /* so switch to intstack */ \
1536: sethi %hi(INT_STACK_SIZE), %l6; \
1.98 pk 1537: sub %l7, %l6, %l6; \
1538: cmp %fp, %l6; \
1.97 pk 1539: blu,a 3f; /* %fp < intstack */ \
1540: add %l7, stackspace, %sp; /* so switch to intstack */ \
1541: b 4f; \
1542: add %fp, stackspace, %sp; /* else stay on intstack */ \
1543: 1: \
1544: /* came from user mode: compute pcb_nw */ \
1.111 pk 1545: sethi %hi(cpcb), %l6; \
1546: ld [%l6 + %lo(cpcb)], %l6; \
1.97 pk 1547: ld [%l6 + PCB_WIM], %l5; \
1548: and %l0, 31, %l4; \
1549: sub %l4, %l5, %l5; \
1550: set uwtab, %l4; \
1551: ldub [%l4 + %l5], %l5; \
1552: st %l5, [%l6 + PCB_UW]; \
1553: /* cond codes still indicate whether in trap window */ \
1554: bz,a 2f; \
1.101 pk 1555: sethi %hi(_EINTSTACKP), %l7; \
1.97 pk 1556: /* yes, in trap window; must save regs */ \
1557: CALL_CLEAN_TRAP_WINDOW; \
1.101 pk 1558: sethi %hi(_EINTSTACKP), %l7; \
1.97 pk 1559: 2: \
1.101 pk 1560: ld [%l7 + %lo(_EINTSTACKP)], %l7; \
1.97 pk 1561: add %l7, stackspace, %sp; \
1562: 3: \
1.101 pk 1563: SET_SP_REDZONE_VAR(_EINTSTACKP, -INT_STACK_SIZE, %l6, %l5); \
1.97 pk 1564: 4: \
1565: CHECK_SP_REDZONE(%l6, %l5)
1.98 pk 1566:
1.97 pk 1567: #else /* MULTIPROCESSOR */
1.98 pk 1568:
1.1 deraadt 1569: #define INTR_SETUP(stackspace) \
1570: rd %wim, %l4; \
1571: mov 1, %l5; \
1572: sll %l5, %l0, %l5; \
1573: btst PSR_PS, %l0; \
1574: bz 1f; \
1575: btst %l5, %l4; \
1576: /* came from kernel mode; cond codes still indicate trap window */ \
1577: bz,a 0f; \
1.111 pk 1578: sethi %hi(_C_LABEL(eintstack)), %l7; \
1.1 deraadt 1579: CALL_CLEAN_TRAP_WINDOW; \
1.111 pk 1580: sethi %hi(_C_LABEL(eintstack)), %l7; \
1.1 deraadt 1581: 0: /* now if %fp >= eintstack, we were on the kernel stack */ \
1582: cmp %fp, %l7; \
1583: bge,a 3f; \
1584: add %l7, stackspace, %sp; /* so switch to intstack */ \
1585: b 4f; \
1586: add %fp, stackspace, %sp; /* else stay on intstack */ \
1587: 1: \
1588: /* came from user mode: compute pcb_nw */ \
1.111 pk 1589: sethi %hi(cpcb), %l6; \
1590: ld [%l6 + %lo(cpcb)], %l6; \
1.1 deraadt 1591: ld [%l6 + PCB_WIM], %l5; \
1592: and %l0, 31, %l4; \
1593: sub %l4, %l5, %l5; \
1594: set uwtab, %l4; \
1595: ldub [%l4 + %l5], %l5; \
1596: st %l5, [%l6 + PCB_UW]; \
1597: /* cond codes still indicate whether in trap window */ \
1598: bz,a 2f; \
1.111 pk 1599: sethi %hi(_C_LABEL(eintstack)), %l7; \
1.1 deraadt 1600: /* yes, in trap window; must save regs */ \
1601: CALL_CLEAN_TRAP_WINDOW; \
1.111 pk 1602: sethi %hi(_C_LABEL(eintstack)), %l7; \
1.1 deraadt 1603: 2: \
1604: add %l7, stackspace, %sp; \
1605: 3: \
1.111 pk 1606: SET_SP_REDZONE_CONST(_C_LABEL(intstack), %l6, %l5); \
1.1 deraadt 1607: 4: \
1608: CHECK_SP_REDZONE(%l6, %l5)
1.97 pk 1609: #endif /* MULTIPROCESSOR */
1.1 deraadt 1610:
1611: /*
1612: * Handler for making the trap window shiny clean.
1613: *
1614: * On entry:
1615: * cpcb->pcb_nw = number of user windows
1616: * %l0 = %psr
1617: * %l1 must not be clobbered
1618: * %l2 must not be clobbered
1619: * %l3 must not be clobbered
1620: * %l4 = address for `return'
1621: * %l7 = saved %g7 (we put this in a delay slot above, to save work)
1622: *
1623: * On return:
1624: * %wim has changed, along with cpcb->pcb_wim
1625: * %g7 has been restored
1626: *
1627: * Normally, we push only one window.
1628: */
1629: clean_trap_window:
1630: mov %g5, %l5 ! save %g5
1631: mov %g6, %l6 ! ... and %g6
1632: /* mov %g7, %l7 ! ... and %g7 (already done for us) */
1.111 pk 1633: sethi %hi(cpcb), %g6 ! get current pcb
1634: ld [%g6 + %lo(cpcb)], %g6
1.1 deraadt 1635:
1636: /* Figure out whether it is a user window (cpcb->pcb_uw > 0). */
1637: ld [%g6 + PCB_UW], %g7
1638: deccc %g7
1639: bge ctw_user
1640: save %g0, %g0, %g0 ! in any case, enter window to save
1641:
1642: /* The window to be pushed is a kernel window. */
1643: std %l0, [%sp + (0*8)]
1644: ctw_merge:
1645: std %l2, [%sp + (1*8)]
1646: std %l4, [%sp + (2*8)]
1647: std %l6, [%sp + (3*8)]
1648: std %i0, [%sp + (4*8)]
1649: std %i2, [%sp + (5*8)]
1650: std %i4, [%sp + (6*8)]
1651: std %i6, [%sp + (7*8)]
1652:
1653: /* Set up new window invalid mask, and update cpcb->pcb_wim. */
1654: rd %psr, %g7 ! g7 = (junk << 5) + new_cwp
1655: mov 1, %g5 ! g5 = 1 << new_cwp;
1656: sll %g5, %g7, %g5
1657: wr %g5, 0, %wim ! setwim(g5);
1658: and %g7, 31, %g7 ! cpcb->pcb_wim = g7 & 31;
1.111 pk 1659: sethi %hi(cpcb), %g6 ! re-get current pcb
1660: ld [%g6 + %lo(cpcb)], %g6
1.1 deraadt 1661: st %g7, [%g6 + PCB_WIM]
1662: nop
1663: restore ! back to trap window
1664:
1665: mov %l5, %g5 ! restore g5
1666: mov %l6, %g6 ! ... and g6
1667: jmp %l4 + 8 ! return to caller
1668: mov %l7, %g7 ! ... and g7
1669: /* NOTREACHED */
1670:
1671: ctw_user:
1672: /*
1673: * The window to be pushed is a user window.
1674: * We must verify the stack pointer (alignment & permissions).
1675: * See comments above definition of PTE_OF_ADDR.
1676: */
1677: st %g7, [%g6 + PCB_UW] ! cpcb->pcb_uw--;
1678: btst 7, %sp ! if not aligned,
1679: bne ctw_invalid ! choke on it
1680: EMPTY
1.13 deraadt 1681:
1.111 pk 1682: sethi %hi(_C_LABEL(pgofset)), %g6 ! trash %g6=curpcb
1683: ld [%g6 + %lo(_C_LABEL(pgofset))], %g6
1.62 pk 1684: PTE_OF_ADDR(%sp, %g7, ctw_invalid, %g6, NOP_ON_4M_1)
1685: CMP_PTE_USER_WRITE(%g7, %g5, NOP_ON_4M_2) ! likewise if not writable
1.1 deraadt 1686: bne ctw_invalid
1687: EMPTY
1.52 pk 1688: /* Note side-effect of SLT_IF_1PAGE_RW: decrements %g6 by 62 */
1.13 deraadt 1689: SLT_IF_1PAGE_RW(%sp, %g7, %g6)
1.1 deraadt 1690: bl,a ctw_merge ! all ok if only 1
1691: std %l0, [%sp]
1692: add %sp, 7*8, %g5 ! check last addr too
1.52 pk 1693: add %g6, 62, %g6 ! restore %g6 to `pgofset'
1.62 pk 1694: PTE_OF_ADDR(%g5, %g7, ctw_invalid, %g6, NOP_ON_4M_3)
1695: CMP_PTE_USER_WRITE(%g7, %g6, NOP_ON_4M_4)
1.1 deraadt 1696: be,a ctw_merge ! all ok: store <l0,l1> and merge
1697: std %l0, [%sp]
1698:
1699: /*
1700: * The window we wanted to push could not be pushed.
1701: * Instead, save ALL user windows into the pcb.
1702: * We will notice later that we did this, when we
1703: * get ready to return from our trap or syscall.
1704: *
1705: * The code here is run rarely and need not be optimal.
1706: */
1707: ctw_invalid:
1708: /*
1709: * Reread cpcb->pcb_uw. We decremented this earlier,
1710: * so it is off by one.
1711: */
1.111 pk 1712: sethi %hi(cpcb), %g6 ! re-get current pcb
1713: ld [%g6 + %lo(cpcb)], %g6
1.13 deraadt 1714:
1.1 deraadt 1715: ld [%g6 + PCB_UW], %g7 ! (number of user windows) - 1
1716: add %g6, PCB_RW, %g5
1717:
1718: /* save g7+1 windows, starting with the current one */
1719: 1: ! do {
1720: std %l0, [%g5 + (0*8)] ! rw->rw_local[0] = l0;
1721: std %l2, [%g5 + (1*8)] ! ...
1722: std %l4, [%g5 + (2*8)]
1723: std %l6, [%g5 + (3*8)]
1724: std %i0, [%g5 + (4*8)]
1725: std %i2, [%g5 + (5*8)]
1726: std %i4, [%g5 + (6*8)]
1727: std %i6, [%g5 + (7*8)]
1728: deccc %g7 ! if (n > 0) save(), rw++;
1729: bge,a 1b ! } while (--n >= 0);
1730: save %g5, 64, %g5
1731:
1732: /* stash sp for bottommost window */
1733: st %sp, [%g5 + 64 + (7*8)]
1734:
1735: /* set up new wim */
1736: rd %psr, %g7 ! g7 = (junk << 5) + new_cwp;
1737: mov 1, %g5 ! g5 = 1 << new_cwp;
1738: sll %g5, %g7, %g5
1739: wr %g5, 0, %wim ! wim = g5;
1740: and %g7, 31, %g7
1741: st %g7, [%g6 + PCB_WIM] ! cpcb->pcb_wim = new_cwp;
1742:
1743: /* fix up pcb fields */
1744: ld [%g6 + PCB_UW], %g7 ! n = cpcb->pcb_uw;
1745: add %g7, 1, %g5
1746: st %g5, [%g6 + PCB_NSAVED] ! cpcb->pcb_nsaved = n + 1;
1747: st %g0, [%g6 + PCB_UW] ! cpcb->pcb_uw = 0;
1748:
1749: /* return to trap window */
1750: 1: deccc %g7 ! do {
1751: bge 1b ! restore();
1752: restore ! } while (--n >= 0);
1753:
1754: mov %l5, %g5 ! restore g5, g6, & g7, and return
1755: mov %l6, %g6
1756: jmp %l4 + 8
1757: mov %l7, %g7
1758: /* NOTREACHED */
1759:
1760:
1761: /*
1762: * Each memory access (text or data) fault, from user or kernel mode,
1763: * comes here. We read the error register and figure out what has
1764: * happened.
1765: *
1766: * This cannot be done from C code since we must not enable traps (and
1767: * hence may not use the `save' instruction) until we have decided that
1768: * the error is or is not an asynchronous one that showed up after a
1769: * synchronous error, but which must be handled before the sync err.
1770: *
1771: * Most memory faults are user mode text or data faults, which can cause
1772: * signal delivery or ptracing, for which we must build a full trapframe.
1773: * It does not seem worthwhile to work to avoid this in the other cases,
1774: * so we store all the %g registers on the stack immediately.
1775: *
1776: * On entry:
1777: * %l0 = %psr
1778: * %l1 = return pc
1779: * %l2 = return npc
1780: * %l3 = T_TEXTFAULT or T_DATAFAULT
1781: *
1782: * Internal:
1783: * %l4 = %y, until we call mem_access_fault (then onto trapframe)
1784: * %l5 = IE_reg_addr, if async mem error
1785: *
1786: */
1.52 pk 1787:
1788: #if defined(SUN4)
1789: memfault_sun4:
1.1 deraadt 1790: TRAP_SETUP(-CCFSZ-80)
1.111 pk 1791: INCR(_C_LABEL(uvmexp)+V_FAULTS) ! cnt.v_faults++ (clobbers %o0,%o1)
1.1 deraadt 1792:
1793: st %g1, [%sp + CCFSZ + 20] ! save g1
1794: rd %y, %l4 ! save y
1795:
1.19 deraadt 1796: /*
1797: * registers:
1798: * memerr.ctrl = memory error control reg., error if 0x80 set
1799: * memerr.vaddr = address of memory error
1800: * buserr = basically just like sun4c sync error reg but
1801: * no SER_WRITE bit (have to figure out from code).
1802: */
1.111 pk 1803: set _C_LABEL(par_err_reg), %o0 ! memerr ctrl addr -- XXX mapped?
1.20 deraadt 1804: ld [%o0], %o0 ! get it
1.19 deraadt 1805: std %g2, [%sp + CCFSZ + 24] ! save g2, g3
1806: ld [%o0], %o1 ! memerr ctrl register
1807: inc 4, %o0 ! now VA of memerr vaddr register
1808: std %g4, [%sp + CCFSZ + 32] ! (sneak g4,g5 in here)
1809: ld [%o0], %o2 ! memerr virt addr
1810: st %g0, [%o0] ! NOTE: this clears latching!!!
1811: btst ME_REG_IERR, %o1 ! memory error?
1812: ! XXX this value may not be correct
1813: ! as I got some parity errors and the
1814: ! correct bits were not on?
1815: std %g6, [%sp + CCFSZ + 40]
1.52 pk 1816: bz,a 0f ! no, just a regular fault
1.19 deraadt 1817: wr %l0, PSR_ET, %psr ! (and reenable traps)
1818:
1819: /* memory error = death for now XXX */
1820: clr %o3
1821: clr %o4
1.111 pk 1822: call _C_LABEL(memerr4_4c) ! memerr(0, ser, sva, 0, 0)
1.19 deraadt 1823: clr %o0
1.111 pk 1824: call _C_LABEL(prom_halt)
1.19 deraadt 1825: nop
1826:
1.52 pk 1827: 0:
1.19 deraadt 1828: /*
1829: * have to make SUN4 emulate SUN4C. 4C code expects
1830: * SER in %o1 and the offending VA in %o2, everything else is ok.
1831: * (must figure out if SER_WRITE should be set)
1832: */
1833: set AC_BUS_ERR, %o0 ! bus error register
1834: cmp %l3, T_TEXTFAULT ! text fault always on PC
1.50 pk 1835: be normal_mem_fault ! go
1.21 deraadt 1836: lduba [%o0] ASI_CONTROL, %o1 ! get its value
1.19 deraadt 1837:
1838: #define STORE_BIT 21 /* bit that indicates a store instruction for sparc */
1839: ld [%l1], %o3 ! offending instruction in %o3 [l1=pc]
1840: srl %o3, STORE_BIT, %o3 ! get load/store bit (wont fit simm13)
1841: btst 1, %o3 ! test for store operation
1842:
1843: bz normal_mem_fault ! if (z) is a load (so branch)
1844: sethi %hi(SER_WRITE), %o5 ! damn SER_WRITE wont fit simm13
1845: ! or %lo(SER_WRITE), %o5, %o5! not necessary since %lo is zero
1846: or %o5, %o1, %o1 ! set SER_WRITE
1847: #if defined(SUN4C) || defined(SUN4M)
1.52 pk 1848: ba,a normal_mem_fault
1849: !!nop ! XXX make efficient later
1.19 deraadt 1850: #endif /* SUN4C || SUN4M */
1851: #endif /* SUN4 */
1.52 pk 1852:
1853: memfault_sun4c:
1854: #if defined(SUN4C)
1855: TRAP_SETUP(-CCFSZ-80)
1.111 pk 1856: INCR(_C_LABEL(uvmexp)+V_FAULTS) ! cnt.v_faults++ (clobbers %o0,%o1)
1.52 pk 1857:
1858: st %g1, [%sp + CCFSZ + 20] ! save g1
1859: rd %y, %l4 ! save y
1860:
1861: /*
1862: * We know about the layout of the error registers here.
1863: * addr reg
1864: * ---- ---
1865: * a AC_SYNC_ERR
1866: * a+4 AC_SYNC_VA
1867: * a+8 AC_ASYNC_ERR
1868: * a+12 AC_ASYNC_VA
1869: */
1.19 deraadt 1870:
1.1 deraadt 1871: #if AC_SYNC_ERR + 4 != AC_SYNC_VA || \
1872: AC_SYNC_ERR + 8 != AC_ASYNC_ERR || AC_SYNC_ERR + 12 != AC_ASYNC_VA
1873: help help help ! I, I, I wanna be a lifeguard
1874: #endif
1875: set AC_SYNC_ERR, %o0
1876: std %g2, [%sp + CCFSZ + 24] ! save g2, g3
1877: lda [%o0] ASI_CONTROL, %o1 ! sync err reg
1878: inc 4, %o0
1879: std %g4, [%sp + CCFSZ + 32] ! (sneak g4,g5 in here)
1880: lda [%o0] ASI_CONTROL, %o2 ! sync virt addr
1881: btst SER_MEMERR, %o1 ! memory error?
1882: std %g6, [%sp + CCFSZ + 40]
1883: bz,a normal_mem_fault ! no, just a regular fault
1884: wr %l0, PSR_ET, %psr ! (and reenable traps)
1885:
1886: /*
1887: * We got a synchronous memory error. It could be one that
1888: * happened because there were two stores in a row, and the
1889: * first went into the write buffer, and the second caused this
1890: * synchronous trap; so there could now be a pending async error.
1891: * This is in fact the case iff the two va's differ.
1892: */
1893: inc 4, %o0
1894: lda [%o0] ASI_CONTROL, %o3 ! async err reg
1895: inc 4, %o0
1896: lda [%o0] ASI_CONTROL, %o4 ! async virt addr
1897: cmp %o2, %o4
1898: be,a 1f ! no, not an async err
1899: wr %l0, PSR_ET, %psr ! (and reenable traps)
1900:
1901: /*
1902: * Handle the async error; ignore the sync error for now
1903: * (we may end up getting it again, but so what?).
1904: * This code is essentially the same as that at `nmi' below,
1905: * but the register usage is different and we cannot merge.
1906: */
1.62 pk 1907: sethi %hi(INTRREG_VA), %l5 ! ienab_bic(IE_ALLIE);
1908: ldub [%l5 + %lo(INTRREG_VA)], %o0
1.1 deraadt 1909: andn %o0, IE_ALLIE, %o0
1.62 pk 1910: stb %o0, [%l5 + %lo(INTRREG_VA)]
1.1 deraadt 1911:
1912: /*
1913: * Now reenable traps and call C code.
1914: * %o1 through %o4 still hold the error reg contents.
1915: * If memerr() returns, return from the trap.
1916: */
1917: wr %l0, PSR_ET, %psr
1.111 pk 1918: call _C_LABEL(memerr4_4c) ! memerr(0, ser, sva, aer, ava)
1.1 deraadt 1919: clr %o0
1920:
1921: ld [%sp + CCFSZ + 20], %g1 ! restore g1 through g7
1922: wr %l0, 0, %psr ! and disable traps, 3 instr delay
1923: ldd [%sp + CCFSZ + 24], %g2
1924: ldd [%sp + CCFSZ + 32], %g4
1925: ldd [%sp + CCFSZ + 40], %g6
1926: /* now safe to set IE_ALLIE again */
1.62 pk 1927: ldub [%l5 + %lo(INTRREG_VA)], %o1
1.1 deraadt 1928: or %o1, IE_ALLIE, %o1
1.62 pk 1929: stb %o1, [%l5 + %lo(INTRREG_VA)]
1.1 deraadt 1930: b return_from_trap
1931: wr %l4, 0, %y ! restore y
1932:
1933: /*
1934: * Trap was a synchronous memory error.
1935: * %o1 through %o4 still hold the error reg contents.
1936: */
1937: 1:
1.111 pk 1938: call _C_LABEL(memerr4_4c) ! memerr(1, ser, sva, aer, ava)
1.1 deraadt 1939: mov 1, %o0
1940:
1941: ld [%sp + CCFSZ + 20], %g1 ! restore g1 through g7
1942: ldd [%sp + CCFSZ + 24], %g2
1943: ldd [%sp + CCFSZ + 32], %g4
1944: ldd [%sp + CCFSZ + 40], %g6
1945: wr %l4, 0, %y ! restore y
1946: b return_from_trap
1947: wr %l0, 0, %psr
1948: /* NOTREACHED */
1.52 pk 1949: #endif /* SUN4C */
1950:
1951: #if defined(SUN4M)
1952: memfault_sun4m:
1.94 pk 1953: ! DANGER: we use the fact that %lo(CPUINFO_VA) is zero
1954: .if CPUINFO_VA & 0x1fff
1955: BARF
1956: .endif
1957: sethi %hi(CPUINFO_VA), %l4
1958: ld [%l4 + %lo(CPUINFO_VA+CPUINFO_GETSYNCFLT)], %l5
1959: jmpl %l5, %l7
1960: or %l4, %lo(CPUINFO_SYNCFLTDUMP), %l4
1.52 pk 1961: TRAP_SETUP(-CCFSZ-80)
1.111 pk 1962: INCR(_C_LABEL(uvmexp)+V_FAULTS) ! cnt.v_faults++ (clobbers %o0,%o1)
1.52 pk 1963:
1964: st %g1, [%sp + CCFSZ + 20] ! save g1
1965: rd %y, %l4 ! save y
1966:
1967: std %g2, [%sp + CCFSZ + 24] ! save g2, g3
1.62 pk 1968: std %g4, [%sp + CCFSZ + 32] ! save g4, g5
1.94 pk 1969: std %g6, [%sp + CCFSZ + 40] ! sneak in g6, g7
1.52 pk 1970:
1.94 pk 1971: ! retrieve sync fault status/address
1972: sethi %hi(CPUINFO_VA+CPUINFO_SYNCFLTDUMP), %o0
1973: ld [%o0 + %lo(CPUINFO_VA+CPUINFO_SYNCFLTDUMP)], %o1
1974: ld [%o0 + %lo(CPUINFO_VA+CPUINFO_SYNCFLTDUMP+4)], %o2
1.52 pk 1975:
1976: wr %l0, PSR_ET, %psr ! reenable traps
1977:
1978: /* Finish stackframe, call C trap handler */
1979: std %l0, [%sp + CCFSZ + 0] ! set tf.tf_psr, tf.tf_pc
1980: mov %l3, %o0 ! (argument: type)
1981: st %l2, [%sp + CCFSZ + 8] ! set tf.tf_npc
1982: st %l4, [%sp + CCFSZ + 12] ! set tf.tf_y
1983: std %i0, [%sp + CCFSZ + 48] ! tf.tf_out[0], etc
1984: std %i2, [%sp + CCFSZ + 56]
1985: std %i4, [%sp + CCFSZ + 64]
1986: std %i6, [%sp + CCFSZ + 72]
1.111 pk 1987: ! mem_access_fault(type,sfsr,sfva,&tf);
1988: call _C_LABEL(mem_access_fault4m)
1.94 pk 1989: add %sp, CCFSZ, %o3 ! (argument: &tf)
1.52 pk 1990:
1991: ldd [%sp + CCFSZ + 0], %l0 ! load new values
1992: ldd [%sp + CCFSZ + 8], %l2
1993: wr %l3, 0, %y
1994: ld [%sp + CCFSZ + 20], %g1
1995: ldd [%sp + CCFSZ + 24], %g2
1996: ldd [%sp + CCFSZ + 32], %g4
1997: ldd [%sp + CCFSZ + 40], %g6
1998: ldd [%sp + CCFSZ + 48], %i0
1999: ldd [%sp + CCFSZ + 56], %i2
2000: ldd [%sp + CCFSZ + 64], %i4
2001: ldd [%sp + CCFSZ + 72], %i6
2002:
2003: b return_from_trap ! go return
2004: wr %l0, 0, %psr ! (but first disable traps again)
2005: #endif /* SUN4M */
1.1 deraadt 2006:
2007: normal_mem_fault:
2008: /*
2009: * Trap was some other error; call C code to deal with it.
2010: * Must finish trap frame (psr,pc,npc,%y,%o0..%o7) in case
2011: * we decide to deliver a signal or ptrace the process.
2012: * %g1..%g7 were already set up above.
2013: */
2014: std %l0, [%sp + CCFSZ + 0] ! set tf.tf_psr, tf.tf_pc
2015: mov %l3, %o0 ! (argument: type)
2016: st %l2, [%sp + CCFSZ + 8] ! set tf.tf_npc
2017: st %l4, [%sp + CCFSZ + 12] ! set tf.tf_y
2018: mov %l1, %o3 ! (argument: pc)
2019: std %i0, [%sp + CCFSZ + 48] ! tf.tf_out[0], etc
2020: std %i2, [%sp + CCFSZ + 56]
2021: mov %l0, %o4 ! (argument: psr)
2022: std %i4, [%sp + CCFSZ + 64]
2023: std %i6, [%sp + CCFSZ + 72]
1.111 pk 2024: call _C_LABEL(mem_access_fault)! mem_access_fault(type, ser, sva,
1.1 deraadt 2025: ! pc, psr, &tf);
2026: add %sp, CCFSZ, %o5 ! (argument: &tf)
2027:
2028: ldd [%sp + CCFSZ + 0], %l0 ! load new values
2029: ldd [%sp + CCFSZ + 8], %l2
2030: wr %l3, 0, %y
2031: ld [%sp + CCFSZ + 20], %g1
2032: ldd [%sp + CCFSZ + 24], %g2
2033: ldd [%sp + CCFSZ + 32], %g4
2034: ldd [%sp + CCFSZ + 40], %g6
2035: ldd [%sp + CCFSZ + 48], %i0
2036: ldd [%sp + CCFSZ + 56], %i2
2037: ldd [%sp + CCFSZ + 64], %i4
2038: ldd [%sp + CCFSZ + 72], %i6
2039:
2040: b return_from_trap ! go return
2041: wr %l0, 0, %psr ! (but first disable traps again)
2042:
2043:
2044: /*
2045: * fp_exception has to check to see if we are trying to save
2046: * the FP state, and if so, continue to save the FP state.
2047: *
2048: * We do not even bother checking to see if we were in kernel mode,
2049: * since users have no access to the special_fp_store instruction.
2050: *
2051: * This whole idea was stolen from Sprite.
2052: */
2053: fp_exception:
2054: set special_fp_store, %l4 ! see if we came from the special one
2055: cmp %l1, %l4 ! pc == special_fp_store?
2056: bne slowtrap ! no, go handle per usual
2057: EMPTY
2058: sethi %hi(savefpcont), %l4 ! yes, "return" to the special code
2059: or %lo(savefpcont), %l4, %l4
2060: jmp %l4
2061: rett %l4 + 4
2062:
2063: /*
2064: * slowtrap() builds a trap frame and calls trap().
2065: * This is called `slowtrap' because it *is*....
2066: * We have to build a full frame for ptrace(), for instance.
2067: *
2068: * Registers:
2069: * %l0 = %psr
2070: * %l1 = return pc
2071: * %l2 = return npc
2072: * %l3 = trap code
2073: */
2074: slowtrap:
2075: TRAP_SETUP(-CCFSZ-80)
2076: /*
2077: * Phew, ready to enable traps and call C code.
2078: */
2079: mov %l3, %o0 ! put type in %o0 for later
2080: Lslowtrap_reenter:
2081: wr %l0, PSR_ET, %psr ! traps on again
2082: std %l0, [%sp + CCFSZ] ! tf.tf_psr = psr; tf.tf_pc = ret_pc;
2083: rd %y, %l3
2084: std %l2, [%sp + CCFSZ + 8] ! tf.tf_npc = return_npc; tf.tf_y = %y;
2085: st %g1, [%sp + CCFSZ + 20]
2086: std %g2, [%sp + CCFSZ + 24]
2087: std %g4, [%sp + CCFSZ + 32]
2088: std %g6, [%sp + CCFSZ + 40]
2089: std %i0, [%sp + CCFSZ + 48]
2090: mov %l0, %o1 ! (psr)
2091: std %i2, [%sp + CCFSZ + 56]
2092: mov %l1, %o2 ! (pc)
2093: std %i4, [%sp + CCFSZ + 64]
2094: add %sp, CCFSZ, %o3 ! (&tf)
1.111 pk 2095: call _C_LABEL(trap) ! trap(type, psr, pc, &tf)
1.1 deraadt 2096: std %i6, [%sp + CCFSZ + 72]
2097:
2098: ldd [%sp + CCFSZ], %l0 ! load new values
2099: ldd [%sp + CCFSZ + 8], %l2
2100: wr %l3, 0, %y
2101: ld [%sp + CCFSZ + 20], %g1
2102: ldd [%sp + CCFSZ + 24], %g2
2103: ldd [%sp + CCFSZ + 32], %g4
2104: ldd [%sp + CCFSZ + 40], %g6
2105: ldd [%sp + CCFSZ + 48], %i0
2106: ldd [%sp + CCFSZ + 56], %i2
2107: ldd [%sp + CCFSZ + 64], %i4
2108: ldd [%sp + CCFSZ + 72], %i6
2109: b return_from_trap
2110: wr %l0, 0, %psr
2111:
2112: /*
2113: * Do a `software' trap by re-entering the trap code, possibly first
2114: * switching from interrupt stack to kernel stack. This is used for
2115: * scheduling and signal ASTs (which generally occur from softclock or
2116: * tty or net interrupts) and register window saves (which might occur
2117: * from anywhere).
2118: *
2119: * The current window is the trap window, and it is by definition clean.
2120: * We enter with the trap type in %o0. All we have to do is jump to
2121: * Lslowtrap_reenter above, but maybe after switching stacks....
2122: */
2123: softtrap:
1.97 pk 2124: #ifdef MULTIPROCESSOR
2125: /*
2126: * The interrupt stack is not at a fixed location
2127: * and %sp must be checked against both ends.
2128: */
1.101 pk 2129: sethi %hi(_EINTSTACKP), %l7
2130: ld [%l7 + %lo(_EINTSTACKP)], %l7
1.97 pk 2131: cmp %sp, %l7
2132: bge Lslowtrap_reenter
2133: EMPTY
2134: set INT_STACK_SIZE, %l6
2135: sub %l7, %l6, %l7
2136: cmp %sp, %l7
2137: blu Lslowtrap_reenter
2138: EMPTY
2139: #else
1.111 pk 2140: sethi %hi(_C_LABEL(eintstack)), %l7
1.1 deraadt 2141: cmp %sp, %l7
2142: bge Lslowtrap_reenter
2143: EMPTY
1.97 pk 2144: #endif
1.111 pk 2145: sethi %hi(cpcb), %l6
2146: ld [%l6 + %lo(cpcb)], %l6
1.13 deraadt 2147: set USPACE-CCFSZ-80, %l5
1.1 deraadt 2148: add %l6, %l5, %l7
2149: SET_SP_REDZONE(%l6, %l5)
2150: b Lslowtrap_reenter
2151: mov %l7, %sp
2152:
2153: #ifdef KGDB
2154: /*
2155: * bpt is entered on all breakpoint traps.
2156: * If this is a kernel breakpoint, we do not want to call trap().
2157: * Among other reasons, this way we can set breakpoints in trap().
2158: */
2159: bpt:
2160: btst PSR_PS, %l0 ! breakpoint from kernel?
2161: bz slowtrap ! no, go do regular trap
2162: nop
2163:
2164: /*
2165: * Build a trap frame for kgdb_trap_glue to copy.
2166: * Enable traps but set ipl high so that we will not
2167: * see interrupts from within breakpoints.
2168: */
2169: TRAP_SETUP(-CCFSZ-80)
2170: or %l0, PSR_PIL, %l4 ! splhigh()
2171: wr %l4, 0, %psr ! the manual claims that this
2172: wr %l4, PSR_ET, %psr ! song and dance is necessary
2173: std %l0, [%sp + CCFSZ + 0] ! tf.tf_psr, tf.tf_pc
2174: mov %l3, %o0 ! trap type arg for kgdb_trap_glue
2175: rd %y, %l3
2176: std %l2, [%sp + CCFSZ + 8] ! tf.tf_npc, tf.tf_y
2177: rd %wim, %l3
2178: st %l3, [%sp + CCFSZ + 16] ! tf.tf_wim (a kgdb-only r/o field)
2179: st %g1, [%sp + CCFSZ + 20] ! tf.tf_global[1]
2180: std %g2, [%sp + CCFSZ + 24] ! etc
2181: std %g4, [%sp + CCFSZ + 32]
2182: std %g6, [%sp + CCFSZ + 40]
2183: std %i0, [%sp + CCFSZ + 48] ! tf.tf_in[0..1]
2184: std %i2, [%sp + CCFSZ + 56] ! etc
2185: std %i4, [%sp + CCFSZ + 64]
2186: std %i6, [%sp + CCFSZ + 72]
2187:
2188: /*
2189: * Now call kgdb_trap_glue(); if it returns, call trap().
2190: */
2191: mov %o0, %l3 ! gotta save trap type
1.111 pk 2192: call _C_LABEL(kgdb_trap_glue)! kgdb_trap_glue(type, &trapframe)
1.1 deraadt 2193: add %sp, CCFSZ, %o1 ! (&trapframe)
2194:
2195: /*
2196: * Use slowtrap to call trap---but first erase our tracks
2197: * (put the registers back the way they were).
2198: */
2199: mov %l3, %o0 ! slowtrap will need trap type
2200: ld [%sp + CCFSZ + 12], %l3
2201: wr %l3, 0, %y
2202: ld [%sp + CCFSZ + 20], %g1
2203: ldd [%sp + CCFSZ + 24], %g2
2204: ldd [%sp + CCFSZ + 32], %g4
2205: b Lslowtrap_reenter
2206: ldd [%sp + CCFSZ + 40], %g6
2207:
2208: /*
2209: * Enter kernel breakpoint. Write all the windows (not including the
2210: * current window) into the stack, so that backtrace works. Copy the
2211: * supplied trap frame to the kgdb stack and switch stacks.
2212: *
2213: * kgdb_trap_glue(type, tf0)
2214: * int type;
2215: * struct trapframe *tf0;
2216: */
1.111 pk 2217: _ENTRY(_C_LABEL(kgdb_trap_glue))
1.1 deraadt 2218: save %sp, -CCFSZ, %sp
2219:
1.111 pk 2220: call _C_LABEL(write_all_windows)
1.1 deraadt 2221: mov %sp, %l4 ! %l4 = current %sp
2222:
2223: /* copy trapframe to top of kgdb stack */
1.125.2.1 bouyer 2224: set _C_LABEL(kgdb_stack) + KGDB_STACK_SIZE - 80, %l0
1.1 deraadt 2225: ! %l0 = tfcopy -> end_of_kgdb_stack
2226: mov 80, %l1
2227: 1: ldd [%i1], %l2
2228: inc 8, %i1
2229: deccc 8, %l1
2230: std %l2, [%l0]
2231: bg 1b
2232: inc 8, %l0
2233:
2234: #ifdef DEBUG
2235: /* save old red zone and then turn it off */
2236: sethi %hi(_redzone), %l7
2237: ld [%l7 + %lo(_redzone)], %l6
2238: st %g0, [%l7 + %lo(_redzone)]
2239: #endif
2240: /* switch to kgdb stack */
2241: add %l0, -CCFSZ-80, %sp
2242:
2243: /* if (kgdb_trap(type, tfcopy)) kgdb_rett(tfcopy); */
2244: mov %i0, %o0
1.111 pk 2245: call _C_LABEL(kgdb_trap)
1.1 deraadt 2246: add %l0, -80, %o1
2247: tst %o0
2248: bnz,a kgdb_rett
2249: add %l0, -80, %g1
2250:
2251: /*
2252: * kgdb_trap() did not handle the trap at all so the stack is
2253: * still intact. A simple `restore' will put everything back,
2254: * after we reset the stack pointer.
2255: */
2256: mov %l4, %sp
2257: #ifdef DEBUG
2258: st %l6, [%l7 + %lo(_redzone)] ! restore red zone
2259: #endif
2260: ret
2261: restore
2262:
2263: /*
2264: * Return from kgdb trap. This is sort of special.
2265: *
2266: * We know that kgdb_trap_glue wrote the window above it, so that we will
2267: * be able to (and are sure to have to) load it up. We also know that we
2268: * came from kernel land and can assume that the %fp (%i6) we load here
2269: * is proper. We must also be sure not to lower ipl (it is at splhigh())
2270: * until we have traps disabled, due to the SPARC taking traps at the
2271: * new ipl before noticing that PSR_ET has been turned off. We are on
2272: * the kgdb stack, so this could be disastrous.
2273: *
2274: * Note that the trapframe argument in %g1 points into the current stack
2275: * frame (current window). We abandon this window when we move %g1->tf_psr
2276: * into %psr, but we will not have loaded the new %sp yet, so again traps
2277: * must be disabled.
2278: */
2279: kgdb_rett:
2280: rd %psr, %g4 ! turn off traps
2281: wr %g4, PSR_ET, %psr
2282: /* use the three-instruction delay to do something useful */
2283: ld [%g1], %g2 ! pick up new %psr
2284: ld [%g1 + 12], %g3 ! set %y
2285: wr %g3, 0, %y
2286: #ifdef DEBUG
2287: st %l6, [%l7 + %lo(_redzone)] ! and restore red zone
2288: #endif
2289: wr %g0, 0, %wim ! enable window changes
2290: nop; nop; nop
2291: /* now safe to set the new psr (changes CWP, leaves traps disabled) */
2292: wr %g2, 0, %psr ! set rett psr (including cond codes)
2293: /* 3 instruction delay before we can use the new window */
2294: /*1*/ ldd [%g1 + 24], %g2 ! set new %g2, %g3
2295: /*2*/ ldd [%g1 + 32], %g4 ! set new %g4, %g5
2296: /*3*/ ldd [%g1 + 40], %g6 ! set new %g6, %g7
2297:
2298: /* now we can use the new window */
2299: mov %g1, %l4
2300: ld [%l4 + 4], %l1 ! get new pc
2301: ld [%l4 + 8], %l2 ! get new npc
2302: ld [%l4 + 20], %g1 ! set new %g1
2303:
2304: /* set up returnee's out registers, including its %sp */
2305: ldd [%l4 + 48], %i0
2306: ldd [%l4 + 56], %i2
2307: ldd [%l4 + 64], %i4
2308: ldd [%l4 + 72], %i6
2309:
2310: /* load returnee's window, making the window above it be invalid */
2311: restore
2312: restore %g0, 1, %l1 ! move to inval window and set %l1 = 1
2313: rd %psr, %l0
2314: sll %l1, %l0, %l1
2315: wr %l1, 0, %wim ! %wim = 1 << (%psr & 31)
1.111 pk 2316: sethi %hi(cpcb), %l1
2317: ld [%l1 + %lo(cpcb)], %l1
1.1 deraadt 2318: and %l0, 31, %l0 ! CWP = %psr & 31;
2319: st %l0, [%l1 + PCB_WIM] ! cpcb->pcb_wim = CWP;
2320: save %g0, %g0, %g0 ! back to window to reload
2321: LOADWIN(%sp)
2322: save %g0, %g0, %g0 ! back to trap window
2323: /* note, we have not altered condition codes; safe to just rett */
2324: RETT
2325: #endif
2326:
2327: /*
2328: * syscall() builds a trap frame and calls syscall().
2329: * sun_syscall is same but delivers sun system call number
2330: * XXX should not have to save&reload ALL the registers just for
2331: * ptrace...
2332: */
1.122 christos 2333: _C_LABEL(_syscall):
1.1 deraadt 2334: TRAP_SETUP(-CCFSZ-80)
2335: wr %l0, PSR_ET, %psr
2336: std %l0, [%sp + CCFSZ + 0] ! tf_psr, tf_pc
2337: rd %y, %l3
2338: std %l2, [%sp + CCFSZ + 8] ! tf_npc, tf_y
2339: st %g1, [%sp + CCFSZ + 20] ! tf_g[1]
2340: std %g2, [%sp + CCFSZ + 24] ! tf_g[2], tf_g[3]
2341: std %g4, [%sp + CCFSZ + 32] ! etc
2342: std %g6, [%sp + CCFSZ + 40]
2343: mov %g1, %o0 ! (code)
2344: std %i0, [%sp + CCFSZ + 48]
2345: add %sp, CCFSZ, %o1 ! (&tf)
2346: std %i2, [%sp + CCFSZ + 56]
2347: mov %l1, %o2 ! (pc)
2348: std %i4, [%sp + CCFSZ + 64]
1.111 pk 2349: call _C_LABEL(syscall) ! syscall(code, &tf, pc, suncompat)
1.1 deraadt 2350: std %i6, [%sp + CCFSZ + 72]
2351: ! now load em all up again, sigh
2352: ldd [%sp + CCFSZ + 0], %l0 ! new %psr, new pc
2353: ldd [%sp + CCFSZ + 8], %l2 ! new npc, new %y
2354: wr %l3, 0, %y
1.51 pk 2355: /* see `proc_trampoline' for the reason for this label */
2356: return_from_syscall:
1.1 deraadt 2357: ld [%sp + CCFSZ + 20], %g1
2358: ldd [%sp + CCFSZ + 24], %g2
2359: ldd [%sp + CCFSZ + 32], %g4
2360: ldd [%sp + CCFSZ + 40], %g6
2361: ldd [%sp + CCFSZ + 48], %i0
2362: ldd [%sp + CCFSZ + 56], %i2
2363: ldd [%sp + CCFSZ + 64], %i4
2364: ldd [%sp + CCFSZ + 72], %i6
2365: b return_from_trap
2366: wr %l0, 0, %psr
2367:
2368: /*
2369: * Interrupts. Software interrupts must be cleared from the software
2370: * interrupt enable register. Rather than calling ienab_bic for each,
2371: * we do them in-line before enabling traps.
2372: *
2373: * After preliminary setup work, the interrupt is passed to each
2374: * registered handler in turn. These are expected to return nonzero if
2375: * they took care of the interrupt. If a handler claims the interrupt,
2376: * we exit (hardware interrupts are latched in the requestor so we'll
2377: * just take another interrupt in the unlikely event of simultaneous
2378: * interrupts from two different devices at the same level). If we go
2379: * through all the registered handlers and no one claims it, we report a
2380: * stray interrupt. This is more or less done as:
2381: *
2382: * for (ih = intrhand[intlev]; ih; ih = ih->ih_next)
2383: * if ((*ih->ih_fun)(ih->ih_arg ? ih->ih_arg : &frame))
2384: * return;
2385: * strayintr(&frame);
2386: *
2387: * Software interrupts are almost the same with three exceptions:
2388: * (1) we clear the interrupt from the software interrupt enable
2389: * register before calling any handler (we have to clear it first
2390: * to avoid an interrupt-losing race),
2391: * (2) we always call all the registered handlers (there is no way
2392: * to tell if the single bit in the software interrupt register
2393: * represents one or many requests)
2394: * (3) we never announce a stray interrupt (because of (1), another
2395: * interrupt request can come in while we're in the handler. If
1.52 pk 2396: * the handler deals with everything for both the original & the
1.1 deraadt 2397: * new request, we'll erroneously report a stray interrupt when
2398: * we take the software interrupt for the new request.
2399: *
2400: * Inputs:
2401: * %l0 = %psr
2402: * %l1 = return pc
2403: * %l2 = return npc
2404: * %l3 = interrupt level
2405: * (software interrupt only) %l4 = bits to clear in interrupt register
2406: *
2407: * Internal:
2408: * %l4, %l5: local variables
2409: * %l6 = %y
2410: * %l7 = %g1
2411: * %g2..%g7 go to stack
2412: *
2413: * An interrupt frame is built in the space for a full trapframe;
2414: * this contains the psr, pc, npc, and interrupt level.
2415: */
1.52 pk 2416: softintr_sun44c:
1.62 pk 2417: sethi %hi(INTRREG_VA), %l6
2418: ldub [%l6 + %lo(INTRREG_VA)], %l5
1.1 deraadt 2419: andn %l5, %l4, %l5
1.62 pk 2420: stb %l5, [%l6 + %lo(INTRREG_VA)]
1.52 pk 2421:
2422: softintr_common:
1.1 deraadt 2423: INTR_SETUP(-CCFSZ-80)
2424: std %g2, [%sp + CCFSZ + 24] ! save registers
1.111 pk 2425: INCR(_C_LABEL(uvmexp)+V_INTR) ! cnt.v_intr++; (clobbers %o0,%o1)
1.1 deraadt 2426: mov %g1, %l7
2427: rd %y, %l6
2428: std %g4, [%sp + CCFSZ + 32]
2429: andn %l0, PSR_PIL, %l4 ! %l4 = psr & ~PSR_PIL |
2430: sll %l3, 8, %l5 ! intlev << IPLSHIFT
2431: std %g6, [%sp + CCFSZ + 40]
2432: or %l5, %l4, %l4 ! ;
2433: wr %l4, 0, %psr ! the manual claims this
2434: wr %l4, PSR_ET, %psr ! song and dance is necessary
2435: std %l0, [%sp + CCFSZ + 0] ! set up intrframe/clockframe
2436: sll %l3, 2, %l5
1.111 pk 2437: set _C_LABEL(intrcnt), %l4 ! intrcnt[intlev]++;
1.1 deraadt 2438: ld [%l4 + %l5], %o0
2439: std %l2, [%sp + CCFSZ + 8]
2440: inc %o0
2441: st %o0, [%l4 + %l5]
1.111 pk 2442: set _C_LABEL(intrhand), %l4 ! %l4 = intrhand[intlev];
1.1 deraadt 2443: ld [%l4 + %l5], %l4
2444: b 3f
2445: st %fp, [%sp + CCFSZ + 16]
2446:
2447: 1: ld [%l4], %o1
2448: ld [%l4 + 4], %o0
2449: tst %o0
2450: bz,a 2f
2451: add %sp, CCFSZ, %o0
2452: 2: jmpl %o1, %o7 ! (void)(*ih->ih_fun)(...)
2453: ld [%l4 + 8], %l4 ! and ih = ih->ih_next
2454: 3: tst %l4 ! while ih != NULL
2455: bnz 1b
2456: nop
2457: mov %l7, %g1
2458: wr %l6, 0, %y
2459: ldd [%sp + CCFSZ + 24], %g2
2460: ldd [%sp + CCFSZ + 32], %g4
2461: ldd [%sp + CCFSZ + 40], %g6
2462: b return_from_trap
2463: wr %l0, 0, %psr
2464:
2465: /*
1.52 pk 2466: * _sparc_interrupt{44c,4m} is exported for paranoia checking
2467: * (see intr.c).
1.1 deraadt 2468: */
1.52 pk 2469: #if defined(SUN4M)
1.111 pk 2470: _ENTRY(_C_LABEL(sparc_interrupt4m))
1.52 pk 2471: mov 1, %l4
1.96 pk 2472: sethi %hi(CPUINFO_VA+CPUINFO_INTREG), %l6
2473: ld [%l6 + %lo(CPUINFO_VA+CPUINFO_INTREG)], %l6
2474: ld [%l6 + ICR_PI_PEND_OFFSET], %l5 ! get pending interrupts
2475: sll %l4, %l3, %l4 ! test SOFTINT bit
1.52 pk 2476: andcc %l5, %l4, %g0
1.111 pk 2477: bne sparc_interrupt_common
1.52 pk 2478: nop
2479:
2480: ! a soft interrupt; clear bit in interrupt-pending register
2481: sll %l4, 16, %l5
1.96 pk 2482: st %l5, [%l6 + ICR_PI_CLR_OFFSET]
1.52 pk 2483: b,a softintr_common
2484: #endif
2485:
1.111 pk 2486: _ENTRY(_C_LABEL(sparc_interrupt44c))
2487: sparc_interrupt_common:
1.1 deraadt 2488: INTR_SETUP(-CCFSZ-80)
2489: std %g2, [%sp + CCFSZ + 24] ! save registers
1.111 pk 2490: INCR(_C_LABEL(uvmexp)+V_INTR) ! cnt.v_intr++; (clobbers %o0,%o1)
1.1 deraadt 2491: mov %g1, %l7
2492: rd %y, %l6
2493: std %g4, [%sp + CCFSZ + 32]
2494: andn %l0, PSR_PIL, %l4 ! %l4 = psr & ~PSR_PIL |
2495: sll %l3, 8, %l5 ! intlev << IPLSHIFT
2496: std %g6, [%sp + CCFSZ + 40]
2497: or %l5, %l4, %l4 ! ;
2498: wr %l4, 0, %psr ! the manual claims this
2499: wr %l4, PSR_ET, %psr ! song and dance is necessary
2500: std %l0, [%sp + CCFSZ + 0] ! set up intrframe/clockframe
2501: sll %l3, 2, %l5
1.111 pk 2502: set _C_LABEL(intrcnt), %l4 ! intrcnt[intlev]++;
1.1 deraadt 2503: ld [%l4 + %l5], %o0
2504: std %l2, [%sp + CCFSZ + 8] ! set up intrframe/clockframe
2505: inc %o0
2506: st %o0, [%l4 + %l5]
1.111 pk 2507: set _C_LABEL(intrhand), %l4 ! %l4 = intrhand[intlev];
1.1 deraadt 2508: ld [%l4 + %l5], %l4
2509: b 3f
2510: st %fp, [%sp + CCFSZ + 16]
2511:
2512: 1: ld [%l4], %o1
2513: ld [%l4 + 4], %o0
2514: tst %o0
2515: bz,a 2f
2516: add %sp, CCFSZ, %o0
2517: 2: jmpl %o1, %o7 ! handled = (*ih->ih_fun)(...)
2518: ld [%l4 + 8], %l4 ! and ih = ih->ih_next
2519: tst %o0
2520: bnz 4f ! if (handled) break
2521: nop
2522: 3: tst %l4
2523: bnz 1b ! while (ih)
2524: nop
1.76 pk 2525:
2526: /* Unhandled interrupts while cold cause IPL to be raised to `high' */
1.111 pk 2527: sethi %hi(_C_LABEL(cold)), %o0
2528: ld [%o0 + %lo(_C_LABEL(cold))], %o0
1.76 pk 2529: tst %o0 ! if (cold) {
2530: bnz,a 4f ! splhigh();
2531: or %l0, 0xf00, %l0 ! } else
2532:
1.111 pk 2533: call _C_LABEL(strayintr) ! strayintr(&intrframe)
1.1 deraadt 2534: add %sp, CCFSZ, %o0
2535: /* all done: restore registers and go return */
2536: 4: mov %l7, %g1
2537: wr %l6, 0, %y
2538: ldd [%sp + CCFSZ + 24], %g2
2539: ldd [%sp + CCFSZ + 32], %g4
2540: ldd [%sp + CCFSZ + 40], %g6
2541: b return_from_trap
2542: wr %l0, 0, %psr
2543:
2544: #ifdef notyet
2545: /*
2546: * Level 12 (ZS serial) interrupt. Handle it quickly, schedule a
2547: * software interrupt, and get out. Do the software interrupt directly
2548: * if we would just take it on the way out.
2549: *
2550: * Input:
2551: * %l0 = %psr
2552: * %l1 = return pc
2553: * %l2 = return npc
2554: * Internal:
2555: * %l3 = zs device
2556: * %l4, %l5 = temporary
2557: * %l6 = rr3 (or temporary data) + 0x100 => need soft int
2558: * %l7 = zs soft status
2559: */
2560: zshard:
2561: #endif /* notyet */
2562:
2563: /*
2564: * Level 15 interrupt. An async memory error has occurred;
2565: * take care of it (typically by panicking, but hey...).
2566: * %l0 = %psr
2567: * %l1 = return pc
2568: * %l2 = return npc
2569: * %l3 = 15 * 4 (why? just because!)
2570: *
2571: * Internal:
2572: * %l4 = %y
2573: * %l5 = %g1
2574: * %l6 = %g6
2575: * %l7 = %g7
2576: * g2, g3, g4, g5 go to stack
2577: *
2578: * This code is almost the same as that in mem_access_fault,
2579: * except that we already know the problem is not a `normal' fault,
2580: * and that we must be extra-careful with interrupt enables.
2581: */
1.52 pk 2582:
2583: #if defined(SUN4)
2584: nmi_sun4:
1.1 deraadt 2585: INTR_SETUP(-CCFSZ-80)
1.111 pk 2586: INCR(_C_LABEL(uvmexp)+V_INTR) ! cnt.v_intr++; (clobbers %o0,%o1)
1.1 deraadt 2587: /*
2588: * Level 15 interrupts are nonmaskable, so with traps off,
2589: * disable all interrupts to prevent recursion.
2590: */
1.62 pk 2591: sethi %hi(INTRREG_VA), %o0
2592: ldub [%o0 + %lo(INTRREG_VA)], %o1
1.52 pk 2593: andn %o0, IE_ALLIE, %o1
1.62 pk 2594: stb %o1, [%o0 + %lo(INTRREG_VA)]
1.1 deraadt 2595: wr %l0, PSR_ET, %psr ! okay, turn traps on again
2596:
2597: std %g2, [%sp + CCFSZ + 0] ! save g2, g3
2598: rd %y, %l4 ! save y
2599:
1.19 deraadt 2600: std %g4, [%sp + CCFSZ + 8] ! save g4, g5
2601: mov %g1, %l5 ! save g1, g6, g7
2602: mov %g6, %l6
2603: mov %g7, %l7
2604: #if defined(SUN4C) || defined(SUN4M)
1.52 pk 2605: b,a nmi_common
1.19 deraadt 2606: #endif /* SUN4C || SUN4M */
1.52 pk 2607: #endif
2608:
2609: #if defined(SUN4C)
2610: nmi_sun4c:
2611: INTR_SETUP(-CCFSZ-80)
1.111 pk 2612: INCR(_C_LABEL(uvmexp)+V_INTR) ! cnt.v_intr++; (clobbers %o0,%o1)
1.52 pk 2613: /*
2614: * Level 15 interrupts are nonmaskable, so with traps off,
2615: * disable all interrupts to prevent recursion.
2616: */
1.62 pk 2617: sethi %hi(INTRREG_VA), %o0
2618: ldub [%o0 + %lo(INTRREG_VA)], %o1
1.52 pk 2619: andn %o0, IE_ALLIE, %o1
1.62 pk 2620: stb %o1, [%o0 + %lo(INTRREG_VA)]
1.52 pk 2621: wr %l0, PSR_ET, %psr ! okay, turn traps on again
2622:
2623: std %g2, [%sp + CCFSZ + 0] ! save g2, g3
2624: rd %y, %l4 ! save y
2625:
2626: ! must read the sync error register too.
1.1 deraadt 2627: set AC_SYNC_ERR, %o0
2628: lda [%o0] ASI_CONTROL, %o1 ! sync err reg
2629: inc 4, %o0
2630: lda [%o0] ASI_CONTROL, %o2 ! sync virt addr
2631: std %g4, [%sp + CCFSZ + 8] ! save g4,g5
2632: mov %g1, %l5 ! save g1,g6,g7
2633: mov %g6, %l6
2634: mov %g7, %l7
2635: inc 4, %o0
2636: lda [%o0] ASI_CONTROL, %o3 ! async err reg
2637: inc 4, %o0
2638: lda [%o0] ASI_CONTROL, %o4 ! async virt addr
1.52 pk 2639: #if defined(SUN4M)
2640: !!b,a nmi_common
2641: #endif /* SUN4M */
2642: #endif /* SUN4C */
2643:
2644: nmi_common:
1.1 deraadt 2645: ! and call C code
1.111 pk 2646: call _C_LABEL(memerr4_4c) ! memerr(0, ser, sva, aer, ava)
1.95 pk 2647: clr %o0
1.1 deraadt 2648:
2649: mov %l5, %g1 ! restore g1 through g7
2650: ldd [%sp + CCFSZ + 0], %g2
2651: ldd [%sp + CCFSZ + 8], %g4
2652: wr %l0, 0, %psr ! re-disable traps
2653: mov %l6, %g6
2654: mov %l7, %g7
2655:
2656: ! set IE_ALLIE again (safe, we disabled traps again above)
1.62 pk 2657: sethi %hi(INTRREG_VA), %o0
2658: ldub [%o0 + %lo(INTRREG_VA)], %o1
1.1 deraadt 2659: or %o1, IE_ALLIE, %o1
1.62 pk 2660: stb %o1, [%o0 + %lo(INTRREG_VA)]
1.1 deraadt 2661: b return_from_trap
2662: wr %l4, 0, %y ! restore y
2663:
1.52 pk 2664: #if defined(SUN4M)
2665: nmi_sun4m:
2666: INTR_SETUP(-CCFSZ-80)
1.111 pk 2667: INCR(_C_LABEL(uvmexp)+V_INTR) ! cnt.v_intr++; (clobbers %o0,%o1)
1.94 pk 2668:
2669: /* Read the Pending Interrupts register */
1.96 pk 2670: sethi %hi(CPUINFO_VA+CPUINFO_INTREG), %l6
2671: ld [%l6 + %lo(CPUINFO_VA+CPUINFO_INTREG)], %l6
2672: ld [%l6 + ICR_PI_PEND_OFFSET], %l5 ! get pending interrupts
2673:
1.111 pk 2674: set _C_LABEL(nmi_soft), %o3 ! assume a softint
1.105 pk 2675: set PINTR_IC, %o1 ! hard lvl 15 bit
2676: sethi %hi(PINTR_SINTRLEV(15)), %o0 ! soft lvl 15 bit
1.94 pk 2677: btst %o0, %l5 ! soft level 15?
1.101 pk 2678: bnz,a 1f !
1.105 pk 2679: mov %o0, %o1 ! shift int clear bit to SOFTINT 15
2680:
1.111 pk 2681: set _C_LABEL(nmi_hard), %o3 ! it's a hardint; switch handler
1.94 pk 2682:
1.52 pk 2683: /*
2684: * Level 15 interrupts are nonmaskable, so with traps off,
2685: * disable all interrupts to prevent recursion.
2686: */
2687: sethi %hi(ICR_SI_SET), %o0
1.101 pk 2688: set SINTR_MA, %o2
2689: st %o2, [%o0 + %lo(ICR_SI_SET)]
1.52 pk 2690:
1.101 pk 2691: 1:
1.105 pk 2692: /*
2693: * Now clear the NMI. Apparently, we must allow some time
2694: * to let the bits sink in..
2695: */
1.96 pk 2696: st %o1, [%l6 + ICR_PI_CLR_OFFSET]
1.105 pk 2697: nop; nop; nop;
2698: ld [%l6 + ICR_PI_PEND_OFFSET], %g0 ! drain register!?
2699: nop; nop; nop;
1.52 pk 2700:
2701: wr %l0, PSR_ET, %psr ! okay, turn traps on again
2702:
2703: std %g2, [%sp + CCFSZ + 0] ! save g2, g3
2704: rd %y, %l4 ! save y
1.94 pk 2705: std %g4, [%sp + CCFSZ + 8] ! save g4,g5
1.52 pk 2706:
2707: /* Finish stackframe, call C trap handler */
2708: mov %g1, %l5 ! save g1,g6,g7
2709: mov %g6, %l6
2710: mov %g7, %l7
2711:
1.105 pk 2712: jmpl %o3, %o7 ! handler(0);
1.94 pk 2713: clr %o0
1.105 pk 2714:
1.52 pk 2715: mov %l5, %g1 ! restore g1 through g7
2716: ldd [%sp + CCFSZ + 0], %g2
2717: ldd [%sp + CCFSZ + 8], %g4
2718: wr %l0, 0, %psr ! re-disable traps
2719: mov %l6, %g6
2720: mov %l7, %g7
2721:
1.105 pk 2722: !cmp %o0, 0 ! was this a soft nmi
2723: !be 4f
2724: !XXX - we need to unblock `mask all ints' only on a hard nmi
1.101 pk 2725:
1.52 pk 2726: ! enable interrupts again (safe, we disabled traps again above)
2727: sethi %hi(ICR_SI_CLR), %o0
2728: set SINTR_MA, %o1
2729: st %o1, [%o0 + %lo(ICR_SI_CLR)]
2730:
1.101 pk 2731: 4:
1.52 pk 2732: b return_from_trap
2733: wr %l4, 0, %y ! restore y
2734: #endif /* SUN4M */
2735:
2736: #ifdef GPROF
2737: .globl window_of, winof_user
2738: .globl window_uf, winuf_user, winuf_ok, winuf_invalid
2739: .globl return_from_trap, rft_kernel, rft_user, rft_invalid
2740: .globl softtrap, slowtrap
1.122 christos 2741: .globl clean_trap_window, _C_LABEL(_syscall)
1.52 pk 2742: #endif
1.1 deraadt 2743:
2744: /*
2745: * Window overflow trap handler.
2746: * %l0 = %psr
2747: * %l1 = return pc
2748: * %l2 = return npc
2749: */
2750: window_of:
2751: #ifdef TRIVIAL_WINDOW_OVERFLOW_HANDLER
2752: /* a trivial version that assumes %sp is ok */
2753: /* (for testing only!) */
2754: save %g0, %g0, %g0
2755: std %l0, [%sp + (0*8)]
2756: rd %psr, %l0
2757: mov 1, %l1
2758: sll %l1, %l0, %l0
2759: wr %l0, 0, %wim
2760: std %l2, [%sp + (1*8)]
2761: std %l4, [%sp + (2*8)]
2762: std %l6, [%sp + (3*8)]
2763: std %i0, [%sp + (4*8)]
2764: std %i2, [%sp + (5*8)]
2765: std %i4, [%sp + (6*8)]
2766: std %i6, [%sp + (7*8)]
2767: restore
2768: RETT
2769: #else
2770: /*
2771: * This is similar to TRAP_SETUP, but we do not want to spend
2772: * a lot of time, so we have separate paths for kernel and user.
2773: * We also know for sure that the window has overflowed.
2774: */
2775: btst PSR_PS, %l0
2776: bz winof_user
2777: sethi %hi(clean_trap_window), %l7
2778:
2779: /*
2780: * Overflow from kernel mode. Call clean_trap_window to
2781: * do the dirty work, then just return, since we know prev
2782: * window is valid. clean_trap_windows might dump all *user*
2783: * windows into the pcb, but we do not care: there is at
2784: * least one kernel window (a trap or interrupt frame!)
2785: * above us.
2786: */
2787: jmpl %l7 + %lo(clean_trap_window), %l4
2788: mov %g7, %l7 ! for clean_trap_window
2789:
2790: wr %l0, 0, %psr ! put back the @%*! cond. codes
2791: nop ! (let them settle in)
2792: RETT
2793:
2794: winof_user:
2795: /*
2796: * Overflow from user mode.
2797: * If clean_trap_window dumps the registers into the pcb,
2798: * rft_user will need to call trap(), so we need space for
2799: * a trap frame. We also have to compute pcb_nw.
2800: *
2801: * SHOULD EXPAND IN LINE TO AVOID BUILDING TRAP FRAME ON
2802: * `EASY' SAVES
2803: */
1.111 pk 2804: sethi %hi(cpcb), %l6
2805: ld [%l6 + %lo(cpcb)], %l6
1.1 deraadt 2806: ld [%l6 + PCB_WIM], %l5
2807: and %l0, 31, %l3
2808: sub %l3, %l5, %l5 /* l5 = CWP - pcb_wim */
2809: set uwtab, %l4
2810: ldub [%l4 + %l5], %l5 /* l5 = uwtab[l5] */
2811: st %l5, [%l6 + PCB_UW]
2812: jmpl %l7 + %lo(clean_trap_window), %l4
2813: mov %g7, %l7 ! for clean_trap_window
1.111 pk 2814: sethi %hi(cpcb), %l6
2815: ld [%l6 + %lo(cpcb)], %l6
1.13 deraadt 2816: set USPACE-CCFSZ-80, %l5
1.1 deraadt 2817: add %l6, %l5, %sp /* over to kernel stack */
2818: CHECK_SP_REDZONE(%l6, %l5)
2819:
2820: /*
2821: * Copy return_from_trap far enough to allow us
2822: * to jump directly to rft_user_or_recover_pcb_windows
2823: * (since we know that is where we are headed).
2824: */
2825: ! and %l0, 31, %l3 ! still set (clean_trap_window
2826: ! leaves this register alone)
2827: set wmask, %l6
2828: ldub [%l6 + %l3], %l5 ! %l5 = 1 << ((CWP + 1) % nwindows)
2829: b rft_user_or_recover_pcb_windows
2830: rd %wim, %l4 ! (read %wim first)
2831: #endif /* end `real' version of window overflow trap handler */
2832:
2833: /*
2834: * Window underflow trap handler.
2835: * %l0 = %psr
2836: * %l1 = return pc
2837: * %l2 = return npc
2838: *
2839: * A picture:
2840: *
2841: * T R I X
2842: * 0 0 0 1 0 0 0 (%wim)
2843: * [bit numbers increase towards the right;
2844: * `restore' moves right & `save' moves left]
2845: *
2846: * T is the current (Trap) window, R is the window that attempted
2847: * a `Restore' instruction, I is the Invalid window, and X is the
2848: * window we want to make invalid before we return.
2849: *
2850: * Since window R is valid, we cannot use rft_user to restore stuff
2851: * for us. We have to duplicate its logic. YUCK.
2852: *
2853: * Incidentally, TRIX are for kids. Silly rabbit!
2854: */
2855: window_uf:
2856: #ifdef TRIVIAL_WINDOW_UNDERFLOW_HANDLER
2857: wr %g0, 0, %wim ! allow us to enter I
2858: restore ! to R
2859: nop
2860: nop
2861: restore ! to I
2862: restore %g0, 1, %l1 ! to X
2863: rd %psr, %l0
2864: sll %l1, %l0, %l0
2865: wr %l0, 0, %wim
2866: save %g0, %g0, %g0 ! back to I
2867: LOADWIN(%sp)
2868: save %g0, %g0, %g0 ! back to R
2869: save %g0, %g0, %g0 ! back to T
2870: RETT
2871: #else
2872: wr %g0, 0, %wim ! allow us to enter I
2873: btst PSR_PS, %l0
2874: restore ! enter window R
2875: bz winuf_user
2876: restore ! enter window I
2877:
2878: /*
2879: * Underflow from kernel mode. Just recover the
2880: * registers and go (except that we have to update
2881: * the blasted user pcb fields).
2882: */
2883: restore %g0, 1, %l1 ! enter window X, then set %l1 to 1
2884: rd %psr, %l0 ! cwp = %psr & 31;
2885: and %l0, 31, %l0
2886: sll %l1, %l0, %l1 ! wim = 1 << cwp;
2887: wr %l1, 0, %wim ! setwim(wim);
1.111 pk 2888: sethi %hi(cpcb), %l1
2889: ld [%l1 + %lo(cpcb)], %l1
1.1 deraadt 2890: st %l0, [%l1 + PCB_WIM] ! cpcb->pcb_wim = cwp;
2891: save %g0, %g0, %g0 ! back to window I
2892: LOADWIN(%sp)
2893: save %g0, %g0, %g0 ! back to R
2894: save %g0, %g0, %g0 ! and then to T
2895: wr %l0, 0, %psr ! fix those cond codes....
2896: nop ! (let them settle in)
2897: RETT
2898:
2899: winuf_user:
2900: /*
2901: * Underflow from user mode.
2902: *
2903: * We cannot use rft_user (as noted above) because
2904: * we must re-execute the `restore' instruction.
2905: * Since it could be, e.g., `restore %l0,0,%l0',
2906: * it is not okay to touch R's registers either.
2907: *
2908: * We are now in window I.
2909: */
2910: btst 7, %sp ! if unaligned, it is invalid
2911: bne winuf_invalid
2912: EMPTY
2913:
1.111 pk 2914: sethi %hi(_C_LABEL(pgofset)), %l4
2915: ld [%l4 + %lo(_C_LABEL(pgofset))], %l4
1.62 pk 2916: PTE_OF_ADDR(%sp, %l7, winuf_invalid, %l4, NOP_ON_4M_5)
2917: CMP_PTE_USER_READ(%l7, %l5, NOP_ON_4M_6) ! if first page not readable,
1.1 deraadt 2918: bne winuf_invalid ! it is invalid
2919: EMPTY
1.13 deraadt 2920: SLT_IF_1PAGE_RW(%sp, %l7, %l4) ! first page is readable
1.1 deraadt 2921: bl,a winuf_ok ! if only one page, enter window X
2922: restore %g0, 1, %l1 ! and goto ok, & set %l1 to 1
2923: add %sp, 7*8, %l5
1.13 deraadt 2924: add %l4, 62, %l4
1.62 pk 2925: PTE_OF_ADDR(%l5, %l7, winuf_invalid, %l4, NOP_ON_4M_7)
2926: CMP_PTE_USER_READ(%l7, %l5, NOP_ON_4M_8) ! check second page too
1.1 deraadt 2927: be,a winuf_ok ! enter window X and goto ok
2928: restore %g0, 1, %l1 ! (and then set %l1 to 1)
2929:
2930: winuf_invalid:
2931: /*
2932: * We were unable to restore the window because %sp
2933: * is invalid or paged out. Return to the trap window
2934: * and call trap(T_WINUF). This will save R to the user
2935: * stack, then load both R and I into the pcb rw[] area,
2936: * and return with pcb_nsaved set to -1 for success, 0 for
2937: * failure. `Failure' indicates that someone goofed with the
2938: * trap registers (e.g., signals), so that we need to return
2939: * from the trap as from a syscall (probably to a signal handler)
2940: * and let it retry the restore instruction later. Note that
2941: * window R will have been pushed out to user space, and thus
2942: * be the invalid window, by the time we get back here. (We
2943: * continue to label it R anyway.) We must also set %wim again,
2944: * and set pcb_uw to 1, before enabling traps. (Window R is the
2945: * only window, and it is a user window).
2946: */
2947: save %g0, %g0, %g0 ! back to R
2948: save %g0, 1, %l4 ! back to T, then %l4 = 1
1.111 pk 2949: sethi %hi(cpcb), %l6
2950: ld [%l6 + %lo(cpcb)], %l6
1.1 deraadt 2951: st %l4, [%l6 + PCB_UW] ! pcb_uw = 1
2952: ld [%l6 + PCB_WIM], %l5 ! get log2(%wim)
2953: sll %l4, %l5, %l4 ! %l4 = old %wim
2954: wr %l4, 0, %wim ! window I is now invalid again
1.13 deraadt 2955: set USPACE-CCFSZ-80, %l5
1.1 deraadt 2956: add %l6, %l5, %sp ! get onto kernel stack
2957: CHECK_SP_REDZONE(%l6, %l5)
2958:
2959: /*
2960: * Okay, call trap(T_WINUF, psr, pc, &tf).
2961: * See `slowtrap' above for operation.
2962: */
2963: wr %l0, PSR_ET, %psr
2964: std %l0, [%sp + CCFSZ + 0] ! tf.tf_psr, tf.tf_pc
2965: rd %y, %l3
2966: std %l2, [%sp + CCFSZ + 8] ! tf.tf_npc, tf.tf_y
2967: mov T_WINUF, %o0
2968: st %g1, [%sp + CCFSZ + 20] ! tf.tf_global[1]
2969: mov %l0, %o1
2970: std %g2, [%sp + CCFSZ + 24] ! etc
2971: mov %l1, %o2
2972: std %g4, [%sp + CCFSZ + 32]
2973: add %sp, CCFSZ, %o3
2974: std %g6, [%sp + CCFSZ + 40]
2975: std %i0, [%sp + CCFSZ + 48] ! tf.tf_out[0], etc
2976: std %i2, [%sp + CCFSZ + 56]
2977: std %i4, [%sp + CCFSZ + 64]
1.111 pk 2978: call _C_LABEL(trap) ! trap(T_WINUF, pc, psr, &tf)
1.1 deraadt 2979: std %i6, [%sp + CCFSZ + 72] ! tf.tf_out[6]
2980:
2981: ldd [%sp + CCFSZ + 0], %l0 ! new psr, pc
2982: ldd [%sp + CCFSZ + 8], %l2 ! new npc, %y
2983: wr %l3, 0, %y
2984: ld [%sp + CCFSZ + 20], %g1
2985: ldd [%sp + CCFSZ + 24], %g2
2986: ldd [%sp + CCFSZ + 32], %g4
2987: ldd [%sp + CCFSZ + 40], %g6
2988: ldd [%sp + CCFSZ + 48], %i0 ! %o0 for window R, etc
2989: ldd [%sp + CCFSZ + 56], %i2
2990: ldd [%sp + CCFSZ + 64], %i4
2991: wr %l0, 0, %psr ! disable traps: test must be atomic
2992: ldd [%sp + CCFSZ + 72], %i6
1.111 pk 2993: sethi %hi(cpcb), %l6
2994: ld [%l6 + %lo(cpcb)], %l6
1.1 deraadt 2995: ld [%l6 + PCB_NSAVED], %l7 ! if nsaved is -1, we have our regs
2996: tst %l7
2997: bl,a 1f ! got them
2998: wr %g0, 0, %wim ! allow us to enter windows R, I
2999: b,a return_from_trap
3000:
3001: /*
3002: * Got 'em. Load 'em up.
3003: */
3004: 1:
3005: mov %g6, %l3 ! save %g6; set %g6 = cpcb
3006: mov %l6, %g6
3007: st %g0, [%g6 + PCB_NSAVED] ! and clear magic flag
3008: restore ! from T to R
3009: restore ! from R to I
3010: restore %g0, 1, %l1 ! from I to X, then %l1 = 1
3011: rd %psr, %l0 ! cwp = %psr;
3012: sll %l1, %l0, %l1
3013: wr %l1, 0, %wim ! make window X invalid
3014: and %l0, 31, %l0
3015: st %l0, [%g6 + PCB_WIM] ! cpcb->pcb_wim = cwp;
3016: nop ! unnecessary? old wim was 0...
3017: save %g0, %g0, %g0 ! back to I
3018: LOADWIN(%g6 + PCB_RW + 64) ! load from rw[1]
3019: save %g0, %g0, %g0 ! back to R
3020: LOADWIN(%g6 + PCB_RW) ! load from rw[0]
3021: save %g0, %g0, %g0 ! back to T
3022: wr %l0, 0, %psr ! restore condition codes
3023: mov %l3, %g6 ! fix %g6
3024: RETT
3025:
3026: /*
3027: * Restoring from user stack, but everything has checked out
3028: * as good. We are now in window X, and %l1 = 1. Window R
3029: * is still valid and holds user values.
3030: */
3031: winuf_ok:
3032: rd %psr, %l0
3033: sll %l1, %l0, %l1
3034: wr %l1, 0, %wim ! make this one invalid
1.111 pk 3035: sethi %hi(cpcb), %l2
3036: ld [%l2 + %lo(cpcb)], %l2
1.1 deraadt 3037: and %l0, 31, %l0
3038: st %l0, [%l2 + PCB_WIM] ! cpcb->pcb_wim = cwp;
3039: save %g0, %g0, %g0 ! back to I
3040: LOADWIN(%sp)
3041: save %g0, %g0, %g0 ! back to R
3042: save %g0, %g0, %g0 ! back to T
3043: wr %l0, 0, %psr ! restore condition codes
3044: nop ! it takes three to tangle
3045: RETT
3046: #endif /* end `real' version of window underflow trap handler */
3047:
3048: /*
3049: * Various return-from-trap routines (see return_from_trap).
3050: */
3051:
3052: /*
3053: * Return from trap, to kernel.
3054: * %l0 = %psr
3055: * %l1 = return pc
3056: * %l2 = return npc
3057: * %l4 = %wim
3058: * %l5 = bit for previous window
3059: */
3060: rft_kernel:
3061: btst %l5, %l4 ! if (wim & l5)
3062: bnz 1f ! goto reload;
3063: wr %l0, 0, %psr ! but first put !@#*% cond codes back
3064:
3065: /* previous window is valid; just rett */
3066: nop ! wait for cond codes to settle in
3067: RETT
3068:
3069: /*
3070: * Previous window is invalid.
3071: * Update %wim and then reload l0..i7 from frame.
3072: *
3073: * T I X
3074: * 0 0 1 0 0 (%wim)
3075: * [see picture in window_uf handler]
3076: *
3077: * T is the current (Trap) window, I is the Invalid window,
3078: * and X is the window we want to make invalid. Window X
3079: * currently has no useful values.
3080: */
3081: 1:
3082: wr %g0, 0, %wim ! allow us to enter window I
3083: nop; nop; nop ! (it takes a while)
3084: restore ! enter window I
3085: restore %g0, 1, %l1 ! enter window X, then %l1 = 1
3086: rd %psr, %l0 ! CWP = %psr & 31;
3087: and %l0, 31, %l0
3088: sll %l1, %l0, %l1 ! wim = 1 << CWP;
3089: wr %l1, 0, %wim ! setwim(wim);
1.111 pk 3090: sethi %hi(cpcb), %l1
3091: ld [%l1 + %lo(cpcb)], %l1
1.1 deraadt 3092: st %l0, [%l1 + PCB_WIM] ! cpcb->pcb_wim = l0 & 31;
3093: save %g0, %g0, %g0 ! back to window I
3094: LOADWIN(%sp)
3095: save %g0, %g0, %g0 ! back to window T
3096: /*
3097: * Note that the condition codes are still set from
3098: * the code at rft_kernel; we can simply return.
3099: */
3100: RETT
3101:
3102: /*
3103: * Return from trap, to user. Checks for scheduling trap (`ast') first;
3104: * will re-enter trap() if set. Note that we may have to switch from
3105: * the interrupt stack to the kernel stack in this case.
3106: * %l0 = %psr
3107: * %l1 = return pc
3108: * %l2 = return npc
3109: * %l4 = %wim
3110: * %l5 = bit for previous window
3111: * %l6 = cpcb
3112: * If returning to a valid window, just set psr and return.
3113: */
3114: rft_user:
1.111 pk 3115: ! sethi %hi(_C_LABEL(want_ast)), %l7 ! (done below)
3116: ld [%l7 + %lo(_C_LABEL(want_ast))], %l7
1.1 deraadt 3117: tst %l7 ! want AST trap?
3118: bne,a softtrap ! yes, re-enter trap with type T_AST
3119: mov T_AST, %o0
3120:
3121: btst %l5, %l4 ! if (wim & l5)
3122: bnz 1f ! goto reload;
3123: wr %l0, 0, %psr ! restore cond codes
3124: nop ! (three instruction delay)
3125: RETT
3126:
3127: /*
3128: * Previous window is invalid.
3129: * Before we try to load it, we must verify its stack pointer.
3130: * This is much like the underflow handler, but a bit easier
3131: * since we can use our own local registers.
3132: */
3133: 1:
3134: btst 7, %fp ! if unaligned, address is invalid
3135: bne rft_invalid
3136: EMPTY
3137:
1.111 pk 3138: sethi %hi(_C_LABEL(pgofset)), %l3
3139: ld [%l3 + %lo(_C_LABEL(pgofset))], %l3
1.62 pk 3140: PTE_OF_ADDR(%fp, %l7, rft_invalid, %l3, NOP_ON_4M_9)
3141: CMP_PTE_USER_READ(%l7, %l5, NOP_ON_4M_10) ! try first page
1.1 deraadt 3142: bne rft_invalid ! no good
3143: EMPTY
1.13 deraadt 3144: SLT_IF_1PAGE_RW(%fp, %l7, %l3)
1.1 deraadt 3145: bl,a rft_user_ok ! only 1 page: ok
3146: wr %g0, 0, %wim
3147: add %fp, 7*8, %l5
1.13 deraadt 3148: add %l3, 62, %l3
1.62 pk 3149: PTE_OF_ADDR(%l5, %l7, rft_invalid, %l3, NOP_ON_4M_11)
3150: CMP_PTE_USER_READ(%l7, %l5, NOP_ON_4M_12) ! check 2nd page too
1.1 deraadt 3151: be,a rft_user_ok
3152: wr %g0, 0, %wim
3153:
3154: /*
3155: * The window we wanted to pull could not be pulled. Instead,
3156: * re-enter trap with type T_RWRET. This will pull the window
3157: * into cpcb->pcb_rw[0] and set cpcb->pcb_nsaved to -1, which we
3158: * will detect when we try to return again.
3159: */
3160: rft_invalid:
3161: b softtrap
3162: mov T_RWRET, %o0
3163:
3164: /*
3165: * The window we want to pull can be pulled directly.
3166: */
3167: rft_user_ok:
3168: ! wr %g0, 0, %wim ! allow us to get into it
3169: wr %l0, 0, %psr ! fix up the cond codes now
3170: nop; nop; nop
3171: restore ! enter window I
3172: restore %g0, 1, %l1 ! enter window X, then %l1 = 1
3173: rd %psr, %l0 ! l0 = (junk << 5) + CWP;
3174: sll %l1, %l0, %l1 ! %wim = 1 << CWP;
3175: wr %l1, 0, %wim
1.111 pk 3176: sethi %hi(cpcb), %l1
3177: ld [%l1 + %lo(cpcb)], %l1
1.1 deraadt 3178: and %l0, 31, %l0
3179: st %l0, [%l1 + PCB_WIM] ! cpcb->pcb_wim = l0 & 31;
3180: save %g0, %g0, %g0 ! back to window I
3181: LOADWIN(%sp) ! suck hard
3182: save %g0, %g0, %g0 ! back to window T
3183: RETT
3184:
3185: /*
3186: * Return from trap. Entered after a
3187: * wr %l0, 0, %psr
3188: * which disables traps so that we can rett; registers are:
3189: *
3190: * %l0 = %psr
3191: * %l1 = return pc
3192: * %l2 = return npc
3193: *
3194: * (%l3..%l7 anything).
3195: *
3196: * If we are returning to user code, we must:
3197: * 1. Check for register windows in the pcb that belong on the stack.
3198: * If there are any, reenter trap with type T_WINOF.
3199: * 2. Make sure the register windows will not underflow. This is
3200: * much easier in kernel mode....
3201: */
3202: return_from_trap:
3203: ! wr %l0, 0, %psr ! disable traps so we can rett
3204: ! (someone else did this already)
3205: and %l0, 31, %l5
3206: set wmask, %l6
3207: ldub [%l6 + %l5], %l5 ! %l5 = 1 << ((CWP + 1) % nwindows)
3208: btst PSR_PS, %l0 ! returning to userland?
3209: bnz rft_kernel ! no, go return to kernel
3210: rd %wim, %l4 ! (read %wim in any case)
3211:
3212: rft_user_or_recover_pcb_windows:
3213: /*
3214: * (entered with %l4=%wim, %l5=wmask[cwp]; %l0..%l2 as usual)
3215: *
3216: * check cpcb->pcb_nsaved:
3217: * if 0, do a `normal' return to user (see rft_user);
3218: * if > 0, cpcb->pcb_rw[] holds registers to be copied to stack;
3219: * if -1, cpcb->pcb_rw[0] holds user registers for rett window
3220: * from an earlier T_RWRET pseudo-trap.
3221: */
1.111 pk 3222: sethi %hi(cpcb), %l6
3223: ld [%l6 + %lo(cpcb)], %l6
1.1 deraadt 3224: ld [%l6 + PCB_NSAVED], %l7
3225: tst %l7
3226: bz,a rft_user
1.111 pk 3227: sethi %hi(_C_LABEL(want_ast)), %l7 ! first instr of rft_user
1.1 deraadt 3228:
3229: bg,a softtrap ! if (pcb_nsaved > 0)
3230: mov T_WINOF, %o0 ! trap(T_WINOF);
3231:
3232: /*
3233: * To get here, we must have tried to return from a previous
3234: * trap and discovered that it would cause a window underflow.
3235: * We then must have tried to pull the registers out of the
3236: * user stack (from the address in %fp==%i6) and discovered
3237: * that it was either unaligned or not loaded in memory, and
3238: * therefore we ran a trap(T_RWRET), which loaded one set of
3239: * registers into cpcb->pcb_pcb_rw[0] (if it had killed the
3240: * process due to a bad stack, we would not be here).
3241: *
3242: * We want to load pcb_rw[0] into the previous window, which
3243: * we know is currently invalid. In other words, we want
3244: * %wim to be 1 << ((cwp + 2) % nwindows).
3245: */
3246: wr %g0, 0, %wim ! enable restores
3247: mov %g6, %l3 ! save g6 in l3
3248: mov %l6, %g6 ! set g6 = &u
3249: st %g0, [%g6 + PCB_NSAVED] ! clear cpcb->pcb_nsaved
3250: restore ! enter window I
3251: restore %g0, 1, %l1 ! enter window X, then %l1 = 1
3252: rd %psr, %l0
3253: sll %l1, %l0, %l1 ! %wim = 1 << CWP;
3254: wr %l1, 0, %wim
3255: and %l0, 31, %l0
3256: st %l0, [%g6 + PCB_WIM] ! cpcb->pcb_wim = CWP;
3257: nop ! unnecessary? old wim was 0...
3258: save %g0, %g0, %g0 ! back to window I
3259: LOADWIN(%g6 + PCB_RW)
3260: save %g0, %g0, %g0 ! back to window T (trap window)
3261: wr %l0, 0, %psr ! cond codes, cond codes everywhere
3262: mov %l3, %g6 ! restore g6
3263: RETT
3264:
3265: ! exported end marker for kernel gdb
1.111 pk 3266: .globl _C_LABEL(endtrapcode)
3267: _C_LABEL(endtrapcode):
1.1 deraadt 3268:
3269: /*
3270: * init_tables(nwin) int nwin;
3271: *
3272: * Set up the uwtab and wmask tables.
3273: * We know nwin > 1.
3274: */
3275: init_tables:
3276: /*
3277: * for (i = -nwin, j = nwin - 2; ++i < 0; j--)
3278: * uwtab[i] = j;
3279: * (loop runs at least once)
3280: */
3281: set uwtab, %o3
3282: sub %g0, %o0, %o1 ! i = -nwin + 1
3283: inc %o1
3284: add %o0, -2, %o2 ! j = nwin - 2;
3285: 0:
3286: stb %o2, [%o3 + %o1] ! uwtab[i] = j;
3287: 1:
3288: inccc %o1 ! ++i < 0?
3289: bl 0b ! yes, continue loop
3290: dec %o2 ! in any case, j--
3291:
3292: /*
3293: * (i now equals 0)
3294: * for (j = nwin - 1; i < nwin; i++, j--)
3295: * uwtab[i] = j;
3296: * (loop runs at least twice)
3297: */
3298: sub %o0, 1, %o2 ! j = nwin - 1
3299: 0:
3300: stb %o2, [%o3 + %o1] ! uwtab[i] = j
3301: inc %o1 ! i++
3302: 1:
3303: cmp %o1, %o0 ! i < nwin?
3304: bl 0b ! yes, continue
3305: dec %o2 ! in any case, j--
3306:
3307: /*
3308: * We observe that, for i in 0..nwin-2, (i+1)%nwin == i+1;
3309: * for i==nwin-1, (i+1)%nwin == 0.
3310: * To avoid adding 1, we run i from 1 to nwin and set
3311: * wmask[i-1].
3312: *
3313: * for (i = j = 1; i < nwin; i++) {
3314: * j <<= 1; (j now == 1 << i)
3315: * wmask[i - 1] = j;
3316: * }
3317: * (loop runs at least once)
3318: */
3319: set wmask - 1, %o3
3320: mov 1, %o1 ! i = 1;
3321: mov 2, %o2 ! j = 2;
3322: 0:
3323: stb %o2, [%o3 + %o1] ! (wmask - 1)[i] = j;
3324: inc %o1 ! i++
3325: cmp %o1, %o0 ! i < nwin?
3326: bl,a 0b ! yes, continue
3327: sll %o2, 1, %o2 ! (and j <<= 1)
3328:
3329: /*
3330: * Now i==nwin, so we want wmask[i-1] = 1.
3331: */
3332: mov 1, %o2 ! j = 1;
3333: retl
3334: stb %o2, [%o3 + %o1] ! (wmask - 1)[i] = j;
3335:
1.13 deraadt 3336: #ifdef SUN4
3337: /*
3338: * getidprom(struct idprom *, sizeof(struct idprom))
3339: */
1.111 pk 3340: _ENTRY(_C_LABEL(getidprom))
1.13 deraadt 3341: set AC_IDPROM, %o2
3342: 1: lduba [%o2] ASI_CONTROL, %o3
3343: stb %o3, [%o0]
3344: inc %o0
3345: inc %o2
3346: dec %o1
3347: cmp %o1, 0
3348: bne 1b
3349: nop
3350: retl
3351: nop
3352: #endif
3353:
1.1 deraadt 3354: dostart:
1.32 pk 3355: /*
3356: * Startup.
3357: *
3358: * We have been loaded in low RAM, at some address which
1.119 christos 3359: * is page aligned (PROM_LOADADDR actually) rather than where we
3360: * want to run (KERNBASE+PROM_LOADADDR). Until we get everything set,
1.32 pk 3361: * we have to be sure to use only pc-relative addressing.
3362: */
3363:
1.27 pk 3364: #ifdef DDB
3365: /*
1.117 christos 3366: * We now use the bootinfo method to pass arguments, and the new
3367: * magic number indicates that. A pointer to esym is passed in
3368: * %o4[0] and the bootinfo structure is passed in %o4[1].
3369: *
3370: * For compatibility with older versions, we check for DDB arguments
3371: * if the older magic number is there. The loader passes `esym' in
3372: * %o4.
1.40 pk 3373: * A DDB magic number is passed in %o5 to allow for bootloaders
1.27 pk 3374: * that know nothing about DDB symbol loading conventions.
1.40 pk 3375: * Note: we don't touch %o1-%o3; SunOS bootloaders seem to use them
3376: * for their own mirky business.
1.73 pk 3377: *
3378: * Pre-NetBSD 1.3 bootblocks had KERNBASE compiled in, and used
1.112 pk 3379: * it to compute the value of `esym'. In order to successfully
1.73 pk 3380: * boot a kernel built with a different value for KERNBASE using
1.112 pk 3381: * old bootblocks, we fixup `esym' here by the difference between
1.73 pk 3382: * KERNBASE and the old value (known to be 0xf8000000) compiled
3383: * into pre-1.3 bootblocks.
3384: * We use the magic number passed as the sixth argument to
3385: * distinguish bootblock versions.
1.27 pk 3386: */
1.117 christos 3387: set KERNBASE, %l4
3388:
3389: set 0x44444232, %l3 ! bootinfo magic
3390: cmp %o5, %l3
3391: bne 1f
1.118 pk 3392: nop
3393:
3394: /* The loader has passed to us a `bootinfo' structure */
3395: ld [%o4], %l3 ! 1st word is esym
1.117 christos 3396: add %l3, %l4, %o5 ! relocate
3397: sethi %hi(_C_LABEL(esym) - KERNBASE), %l3 ! store esym
3398: st %o5, [%l3 + %lo(_C_LABEL(esym) - KERNBASE)]
1.120 pk 3399:
3400: ld [%o4 + 4], %l3 ! 2nd word is bootinfo
1.117 christos 3401: add %l3, %l4, %o5 ! relocate
3402: sethi %hi(_C_LABEL(bootinfo) - KERNBASE), %l3 ! store bootinfo
3403: st %o5, [%l3 + %lo(_C_LABEL(bootinfo) - KERNBASE)]
1.118 pk 3404: b,a 3f
1.117 christos 3405:
1.118 pk 3406: 1:
1.120 pk 3407: /* Check for old-style DDB loader magic */
1.117 christos 3408: set 0x44444231, %l3 ! ddb magic
3409: cmp %o5, %l3
1.118 pk 3410: be,a 2f
3411: clr %l4 ! if DDB_MAGIC1, clear %l4
1.115 christos 3412:
1.117 christos 3413: set 0x44444230, %l3 ! compat magic
3414: cmp %o5, %l3
3415: bne 3f
1.73 pk 3416:
1.118 pk 3417: ! note: %l4 set to KERNBASE above.
1.73 pk 3418: set 0xf8000000, %l5 ! compute correction term:
3419: sub %l5, %l4, %l4 ! old KERNBASE (0xf8000000 ) - KERNBASE
3420:
1.117 christos 3421: 2:
1.40 pk 3422: tst %o4 ! do we have the symbols?
1.117 christos 3423: bz 3f
1.73 pk 3424: sub %o4, %l4, %o4 ! apply compat correction
1.112 pk 3425: sethi %hi(_C_LABEL(esym) - KERNBASE), %l3 ! store esym
3426: st %o4, [%l3 + %lo(_C_LABEL(esym) - KERNBASE)]
1.117 christos 3427: 3:
1.27 pk 3428: #endif
1.13 deraadt 3429: /*
3430: * Sun4 passes in the `load address'. Although possible, its highly
3431: * unlikely that OpenBoot would place the prom vector there.
3432: */
1.119 christos 3433: set PROM_LOADADDR, %g7
1.17 pk 3434: cmp %o0, %g7
1.50 pk 3435: be is_sun4
1.14 deraadt 3436: nop
3437:
1.20 deraadt 3438: #if defined(SUN4C) || defined(SUN4M)
1.14 deraadt 3439: mov %o0, %g7 ! save prom vector pointer
1.9 deraadt 3440:
1.109 pk 3441: /* First, check `romp->pv_magic' */
3442: ld [%g7 + PV_MAGIC], %o0 ! v = pv->pv_magic
3443: set OBP_MAGIC, %o1
3444: cmp %o0, %o1 ! if ( v != OBP_MAGIC) {
3445: bne is_openfirm ! assume this is an OPENFIRM machine
3446: nop ! }
3447:
1.13 deraadt 3448: /*
3449: * are we on a sun4c or a sun4m?
3450: */
1.28 deraadt 3451: ld [%g7 + PV_NODEOPS], %o4 ! node = pv->pv_nodeops->no_nextnode(0)
3452: ld [%o4 + NO_NEXTNODE], %o4
1.18 deraadt 3453: call %o4
3454: mov 0, %o0 ! node
1.37 pk 3455:
3456: mov %o0, %l0
1.111 pk 3457: set cputypvar-KERNBASE, %o1 ! name = "compatible"
3458: set cputypval-KERNBASE, %o2 ! buffer ptr (assume buffer long enough)
1.28 deraadt 3459: ld [%g7 + PV_NODEOPS], %o4 ! (void)pv->pv_nodeops->no_getprop(...)
3460: ld [%o4 + NO_GETPROP], %o4
1.18 deraadt 3461: call %o4
3462: nop
1.111 pk 3463: set cputypval-KERNBASE, %o2 ! buffer ptr
1.18 deraadt 3464: ldub [%o2 + 4], %o0 ! which is it... "sun4c", "sun4m", "sun4d"?
3465: cmp %o0, 'c'
1.50 pk 3466: be is_sun4c
1.13 deraadt 3467: nop
1.18 deraadt 3468: cmp %o0, 'm'
1.50 pk 3469: be is_sun4m
1.18 deraadt 3470: nop
1.20 deraadt 3471: #endif /* SUN4C || SUN4M */
1.18 deraadt 3472:
3473: ! ``on a sun4d?! hell no!''
1.28 deraadt 3474: ld [%g7 + PV_HALT], %o1 ! by this kernel, then halt
1.18 deraadt 3475: call %o1
3476: nop
3477:
1.109 pk 3478: is_openfirm:
3479: mov %o3, %g7 ! OPENFIRMWARE entry point is in %o3
3480: /* FALLTHROUGH to sun4m case */
3481:
1.18 deraadt 3482: is_sun4m:
1.13 deraadt 3483: #if defined(SUN4M)
1.52 pk 3484: set trapbase_sun4m, %g6
1.13 deraadt 3485: mov SUN4CM_PGSHIFT, %g5
3486: b start_havetype
3487: mov CPU_SUN4M, %g4
3488: #else
1.9 deraadt 3489: set sun4m_notsup-KERNBASE, %o0
1.28 deraadt 3490: ld [%g7 + PV_EVAL], %o1
1.9 deraadt 3491: call %o1 ! print a message saying that the
3492: nop ! sun4m architecture is not supported
1.28 deraadt 3493: ld [%g7 + PV_HALT], %o1 ! by this kernel, then halt
1.9 deraadt 3494: call %o1
3495: nop
1.13 deraadt 3496: /*NOTREACHED*/
3497: #endif
3498: is_sun4c:
3499: #if defined(SUN4C)
1.52 pk 3500: set trapbase_sun4c, %g6
1.13 deraadt 3501: mov SUN4CM_PGSHIFT, %g5
3502:
3503: set AC_CONTEXT, %g1 ! paranoia: set context to kernel
3504: stba %g0, [%g1] ASI_CONTROL
3505:
3506: b start_havetype
3507: mov CPU_SUN4C, %g4 ! XXX CPU_SUN4
1.9 deraadt 3508: #else
3509: set sun4c_notsup-KERNBASE, %o0
1.28 deraadt 3510:
3511: ld [%g7 + PV_ROMVEC_VERS], %o1
3512: cmp %o1, 0
3513: bne 1f
3514: nop
3515:
3516: ! stupid version 0 rom interface is pv_eval(int length, char *string)
3517: mov %o0, %o1
3518: 2: ldub [%o0], %o4
3519: bne 2b
3520: inc %o0
3521: dec %o0
3522: sub %o0, %o1, %o0
3523:
3524: 1: ld [%g7 + PV_EVAL], %o2
3525: call %o2 ! print a message saying that the
1.9 deraadt 3526: nop ! sun4c architecture is not supported
1.28 deraadt 3527: ld [%g7 + PV_HALT], %o1 ! by this kernel, then halt
1.9 deraadt 3528: call %o1
3529: nop
1.13 deraadt 3530: /*NOTREACHED*/
1.9 deraadt 3531: #endif
1.13 deraadt 3532: is_sun4:
3533: #if defined(SUN4)
1.52 pk 3534: set trapbase_sun4, %g6
1.13 deraadt 3535: mov SUN4_PGSHIFT, %g5
1.1 deraadt 3536:
1.13 deraadt 3537: set AC_CONTEXT, %g1 ! paranoia: set context to kernel
3538: stba %g0, [%g1] ASI_CONTROL
3539:
3540: b start_havetype
1.14 deraadt 3541: mov CPU_SUN4, %g4
1.13 deraadt 3542: #else
1.14 deraadt 3543: set PROM_BASE, %g7
3544:
1.13 deraadt 3545: set sun4_notsup-KERNBASE, %o0
1.28 deraadt 3546: ld [%g7 + OLDMON_PRINTF], %o1
1.13 deraadt 3547: call %o1 ! print a message saying that the
3548: nop ! sun4 architecture is not supported
1.28 deraadt 3549: ld [%g7 + OLDMON_HALT], %o1 ! by this kernel, then halt
1.13 deraadt 3550: call %o1
3551: nop
3552: /*NOTREACHED*/
3553: #endif
3554:
3555: start_havetype:
1.1 deraadt 3556: /*
3557: * Step 1: double map low RAM (addresses [0.._end-start-1])
3558: * to KERNBASE (addresses [KERNBASE.._end-1]). None of these
3559: * are `bad' aliases (since they are all on segment boundaries)
3560: * so we do not have to worry about cache aliasing.
3561: *
3562: * We map in another couple of segments just to have some
3563: * more memory (512K, actually) guaranteed available for
3564: * bootstrap code (pmap_bootstrap needs memory to hold MMU
1.39 pk 3565: * and context data structures). Note: this is only relevant
3566: * for 2-level MMU sun4/sun4c machines.
1.1 deraadt 3567: */
3568: clr %l0 ! lowva
3569: set KERNBASE, %l1 ! highva
3570: set _end + (2 << 18), %l2 ! last va that must be remapped
1.8 pk 3571: #ifdef DDB
1.112 pk 3572: sethi %hi(_C_LABEL(esym) - KERNBASE), %o1
3573: ld [%o1+%lo(_C_LABEL(esym) - KERNBASE)], %o1
1.27 pk 3574: tst %o1
1.8 pk 3575: bz 1f
3576: nop
1.27 pk 3577: set (2 << 18), %l2
3578: add %l2, %o1, %l2 ! last va that must be remapped
1.8 pk 3579: 1:
3580: #endif
1.13 deraadt 3581: /*
3582: * Need different initial mapping functions for different
3583: * types of machines.
3584: */
3585: #if defined(SUN4C)
3586: cmp %g4, CPU_SUN4C
1.9 deraadt 3587: bne 1f
1.14 deraadt 3588: set 1 << 18, %l3 ! segment size in bytes
1.1 deraadt 3589: 0:
3590: lduba [%l0] ASI_SEGMAP, %l4 ! segmap[highva] = segmap[lowva];
3591: stba %l4, [%l1] ASI_SEGMAP
3592: add %l3, %l1, %l1 ! highva += segsiz;
3593: cmp %l1, %l2 ! done?
1.34 pk 3594: blu 0b ! no, loop
1.1 deraadt 3595: add %l3, %l0, %l0 ! (and lowva += segsz)
1.125.2.2! bouyer 3596: b,a startmap_done
1.52 pk 3597: 1:
1.13 deraadt 3598: #endif /* SUN4C */
1.125.2.2! bouyer 3599:
1.13 deraadt 3600: #if defined(SUN4)
3601: cmp %g4, CPU_SUN4
3602: bne 2f
1.114 pk 3603: #if defined(SUN4_MMU3L)
1.34 pk 3604: set AC_IDPROM+1, %l3
3605: lduba [%l3] ASI_CONTROL, %l3
3606: cmp %l3, 0x24 ! XXX - SUN4_400
3607: bne no_3mmu
1.125.2.1 bouyer 3608: nop
1.125.2.2! bouyer 3609:
! 3610: /*
! 3611: * Three-level sun4 MMU.
! 3612: * Double-map by duplicating a single region entry (which covers
! 3613: * 16MB) corresponding to the kernel's virtual load address.
! 3614: */
1.34 pk 3615: add %l0, 2, %l0 ! get to proper half-word in RG space
3616: add %l1, 2, %l1
3617: lduha [%l0] ASI_REGMAP, %l4 ! regmap[highva] = regmap[lowva];
3618: stha %l4, [%l1] ASI_REGMAP
1.125.2.2! bouyer 3619: b,a startmap_done
1.34 pk 3620: no_3mmu:
3621: #endif
1.125.2.2! bouyer 3622:
! 3623: /*
! 3624: * Three-level sun4 MMU.
! 3625: * Double-map by duplicating the required number of segment
! 3626: * entries corresponding to the kernel's virtual load address.
! 3627: */
! 3628: set 1 << 18, %l3 ! segment size in bytes
1.13 deraadt 3629: 0:
3630: lduha [%l0] ASI_SEGMAP, %l4 ! segmap[highva] = segmap[lowva];
3631: stha %l4, [%l1] ASI_SEGMAP
3632: add %l3, %l1, %l1 ! highva += segsiz;
3633: cmp %l1, %l2 ! done?
1.34 pk 3634: blu 0b ! no, loop
1.13 deraadt 3635: add %l3, %l0, %l0 ! (and lowva += segsz)
1.37 pk 3636: b,a startmap_done
1.52 pk 3637: 2:
1.13 deraadt 3638: #endif /* SUN4 */
1.125.2.2! bouyer 3639:
1.9 deraadt 3640: #if defined(SUN4M)
1.13 deraadt 3641: cmp %g4, CPU_SUN4M ! skip for sun4m!
3642: bne 3f
3643:
1.37 pk 3644: /*
1.38 pk 3645: * The OBP guarantees us a 16MB mapping using a level 1 PTE at
1.125.2.2! bouyer 3646: * the start of the memory bank in which we were loaded. All we
! 3647: * have to do is copy the entry.
! 3648: * Also, we must check to see if we have a TI Viking in non-mbus mode,
! 3649: * and if so do appropriate flipping and turning off traps before
1.38 pk 3650: * we dork with MMU passthrough. -grrr
1.37 pk 3651: */
3652:
1.38 pk 3653: sethi %hi(0x40000000), %o1 ! TI version bit
3654: rd %psr, %o0
3655: andcc %o0, %o1, %g0
3656: be remap_notvik ! is non-TI normal MBUS module
3657: lda [%g0] ASI_SRMMU, %o0 ! load MMU
3658: andcc %o0, 0x800, %g0
3659: bne remap_notvik ! It is a viking MBUS module
3660: nop
3661:
3662: /*
3663: * Ok, we have a non-Mbus TI Viking, a MicroSparc.
3664: * In this scenerio, in order to play with the MMU
3665: * passthrough safely, we need turn off traps, flip
3666: * the AC bit on in the mmu status register, do our
3667: * passthroughs, then restore the mmu reg and %psr
3668: */
3669: rd %psr, %o4 ! saved here till done
3670: andn %o4, 0x20, %o5
3671: wr %o5, 0x0, %psr
3672: nop; nop; nop;
3673: set SRMMU_CXTPTR, %o0
3674: lda [%o0] ASI_SRMMU, %o0 ! get context table ptr
3675: sll %o0, 4, %o0 ! make physical
3676: lda [%g0] ASI_SRMMU, %o3 ! hold mmu-sreg here
3677: /* 0x8000 is AC bit in Viking mmu-ctl reg */
3678: set 0x8000, %o2
3679: or %o3, %o2, %o2
3680: sta %o2, [%g0] ASI_SRMMU ! AC bit on
1.125.2.2! bouyer 3681:
1.38 pk 3682: lda [%o0] ASI_BYPASS, %o1
3683: srl %o1, 4, %o1
3684: sll %o1, 8, %o1 ! get phys addr of l1 entry
3685: lda [%o1] ASI_BYPASS, %l4
3686: srl %l1, 22, %o2 ! note: 22 == RGSHIFT - 2
3687: add %o1, %o2, %o1
3688: sta %l4, [%o1] ASI_BYPASS
1.125.2.2! bouyer 3689:
1.38 pk 3690: sta %o3, [%g0] ASI_SRMMU ! restore mmu-sreg
3691: wr %o4, 0x0, %psr ! restore psr
1.37 pk 3692: b,a startmap_done
1.38 pk 3693:
3694: /*
3695: * The following is generic and should work on all
3696: * Mbus based SRMMU's.
3697: */
3698: remap_notvik:
3699: set SRMMU_CXTPTR, %o0
3700: lda [%o0] ASI_SRMMU, %o0 ! get context table ptr
3701: sll %o0, 4, %o0 ! make physical
3702: lda [%o0] ASI_BYPASS, %o1
3703: srl %o1, 4, %o1
3704: sll %o1, 8, %o1 ! get phys addr of l1 entry
3705: lda [%o1] ASI_BYPASS, %l4
3706: srl %l1, 22, %o2 ! note: 22 == RGSHIFT - 2
3707: add %o1, %o2, %o1
3708: sta %l4, [%o1] ASI_BYPASS
1.52 pk 3709: !b,a startmap_done
1.38 pk 3710:
1.52 pk 3711: 3:
1.9 deraadt 3712: #endif /* SUN4M */
1.13 deraadt 3713: ! botch! We should blow up.
3714:
3715: startmap_done:
1.1 deraadt 3716: /*
3717: * All set, fix pc and npc. Once we are where we should be,
3718: * we can give ourselves a stack and enable traps.
3719: */
1.9 deraadt 3720: set 1f, %g1
3721: jmp %g1
1.1 deraadt 3722: nop
3723: 1:
1.111 pk 3724: sethi %hi(_C_LABEL(cputyp)), %o0 ! what type of cpu we are on
3725: st %g4, [%o0 + %lo(_C_LABEL(cputyp))]
1.9 deraadt 3726:
1.111 pk 3727: sethi %hi(_C_LABEL(pgshift)), %o0 ! pgshift = log2(nbpg)
3728: st %g5, [%o0 + %lo(_C_LABEL(pgshift))]
1.13 deraadt 3729:
3730: mov 1, %o0 ! nbpg = 1 << pgshift
3731: sll %o0, %g5, %g5
1.111 pk 3732: sethi %hi(_C_LABEL(nbpg)), %o0 ! nbpg = bytes in a page
3733: st %g5, [%o0 + %lo(_C_LABEL(nbpg))]
1.13 deraadt 3734:
3735: sub %g5, 1, %g5
1.111 pk 3736: sethi %hi(_C_LABEL(pgofset)), %o0 ! page offset = bytes in a page - 1
3737: st %g5, [%o0 + %lo(_C_LABEL(pgofset))]
1.13 deraadt 3738:
1.9 deraadt 3739: rd %psr, %g3 ! paranoia: make sure ...
3740: andn %g3, PSR_ET, %g3 ! we have traps off
3741: wr %g3, 0, %psr ! so that we can fiddle safely
3742: nop; nop; nop
3743:
3744: wr %g0, 0, %wim ! make sure we can set psr
3745: nop; nop; nop
3746: wr %g0, PSR_S|PSR_PS|PSR_PIL, %psr ! set initial psr
3747: nop; nop; nop
3748:
3749: wr %g0, 2, %wim ! set initial %wim (w1 invalid)
3750: mov 1, %g1 ! set pcb_wim (log2(%wim) = 1)
1.111 pk 3751: sethi %hi(_C_LABEL(u0) + PCB_WIM), %g2
3752: st %g1, [%g2 + %lo(_C_LABEL(u0) + PCB_WIM)]
1.9 deraadt 3753:
1.1 deraadt 3754: set USRSTACK - CCFSZ, %fp ! as if called from user code
3755: set estack0 - CCFSZ - 80, %sp ! via syscall(boot_me_up) or somesuch
3756: rd %psr, %l0
3757: wr %l0, PSR_ET, %psr
1.9 deraadt 3758: nop; nop; nop
1.1 deraadt 3759:
1.52 pk 3760: /* Export actual trapbase */
1.111 pk 3761: sethi %hi(_C_LABEL(trapbase)), %o0
3762: st %g6, [%o0+%lo(_C_LABEL(trapbase))]
1.52 pk 3763:
1.117 christos 3764: #ifdef notdef
1.1 deraadt 3765: /*
3766: * Step 2: clear BSS. This may just be paranoia; the boot
3767: * loader might already do it for us; but what the hell.
3768: */
3769: set _edata, %o0 ! bzero(edata, end - edata)
3770: set _end, %o1
1.111 pk 3771: call _C_LABEL(bzero)
1.1 deraadt 3772: sub %o1, %o0, %o1
1.117 christos 3773: #endif
1.1 deraadt 3774:
3775: /*
3776: * Stash prom vectors now, after bzero, as it lives in bss
3777: * (which we just zeroed).
3778: * This depends on the fact that bzero does not use %g7.
3779: */
1.111 pk 3780: sethi %hi(_C_LABEL(romp)), %l0
3781: st %g7, [%l0 + %lo(_C_LABEL(romp))]
1.1 deraadt 3782:
3783: /*
3784: * Step 3: compute number of windows and set up tables.
3785: * We could do some of this later.
3786: */
3787: save %sp, -64, %sp
3788: rd %psr, %g1
3789: restore
3790: and %g1, 31, %g1 ! want just the CWP bits
3791: add %g1, 1, %o0 ! compute nwindows
1.111 pk 3792: sethi %hi(_C_LABEL(nwindows)), %o1 ! may as well tell everyone
1.1 deraadt 3793: call init_tables
1.111 pk 3794: st %o0, [%o1 + %lo(_C_LABEL(nwindows))]
1.1 deraadt 3795:
1.52 pk 3796: #if defined(SUN4)
1.29 deraadt 3797: /*
3798: * Some sun4 models have fewer than 8 windows. For extra
3799: * speed, we do not need to save/restore those windows
3800: * The save/restore code has 7 "save"'s followed by 7
3801: * "restore"'s -- we "nop" out the last "save" and first
3802: * "restore"
3803: */
3804: cmp %o0, 8
1.50 pk 3805: be 1f
1.29 deraadt 3806: noplab: nop
3807: set noplab, %l0
3808: ld [%l0], %l1
3809: set wb1, %l0
3810: st %l1, [%l0 + 6*4]
3811: st %l1, [%l0 + 7*4]
3812: 1:
3813: #endif
3814:
1.62 pk 3815: #if ((defined(SUN4) || defined(SUN4C)) && defined(SUN4M))
3816:
3817: /*
3818: * Patch instructions at specified labels that start
3819: * per-architecture code-paths.
3820: */
3821: Lgandul: nop
3822:
3823: #define MUNGE(label) \
3824: sethi %hi(label), %o0; \
3825: st %l0, [%o0 + %lo(label)]
3826:
3827: sethi %hi(Lgandul), %o0
3828: ld [%o0 + %lo(Lgandul)], %l0 ! %l0 = NOP
3829:
3830: cmp %g4, CPU_SUN4M
3831: bne,a 1f
3832: nop
3833:
3834: ! this should be automated!
3835: MUNGE(NOP_ON_4M_1)
3836: MUNGE(NOP_ON_4M_2)
3837: MUNGE(NOP_ON_4M_3)
3838: MUNGE(NOP_ON_4M_4)
3839: MUNGE(NOP_ON_4M_5)
3840: MUNGE(NOP_ON_4M_6)
3841: MUNGE(NOP_ON_4M_7)
3842: MUNGE(NOP_ON_4M_8)
3843: MUNGE(NOP_ON_4M_9)
3844: MUNGE(NOP_ON_4M_10)
3845: MUNGE(NOP_ON_4M_11)
3846: MUNGE(NOP_ON_4M_12)
3847: MUNGE(NOP_ON_4M_13)
3848: MUNGE(NOP_ON_4M_14)
3849: b,a 2f
3850:
3851: 1:
1.68 mycroft 3852: MUNGE(NOP_ON_4_4C_1)
1.62 pk 3853:
3854: 2:
3855:
3856: #undef MUNGE
3857: #endif
3858:
1.1 deraadt 3859: /*
3860: * Step 4: change the trap base register, now that our trap handlers
3861: * will function (they need the tables we just set up).
1.52 pk 3862: * This depends on the fact that bzero does not use %g6.
1.1 deraadt 3863: */
1.52 pk 3864: wr %g6, 0, %tbr
1.9 deraadt 3865: nop; nop; nop ! paranoia
1.37 pk 3866:
1.98 pk 3867:
3868: /* Clear `cpuinfo' */
3869: sethi %hi(CPUINFO_VA), %o0 ! bzero(&cpuinfo, NBPG)
3870: sethi %hi(CPUINFO_STRUCTSIZE), %o1
1.111 pk 3871: call _C_LABEL(bzero)
1.98 pk 3872: add %o1, %lo(CPUINFO_STRUCTSIZE), %o1
3873:
1.125.2.1 bouyer 3874: /*
3875: * Initialize `cpuinfo' fields which are needed early. Note
3876: * we make the cpuinfo self-reference at the local VA for now.
3877: * It may be changed to reference a global VA later.
3878: */
1.111 pk 3879: set _C_LABEL(u0), %o0 ! cpuinfo.curpcb = u0;
3880: sethi %hi(cpcb), %l0
3881: st %o0, [%l0 + %lo(cpcb)]
1.98 pk 3882:
1.125.2.1 bouyer 3883: sethi %hi(CPUINFO_VA), %o0 ! cpuinfo.ci_self = &cpuinfo;
3884: sethi %hi(_CISELFP), %l0
3885: st %o0, [%l0 + %lo(_CISELFP)]
3886:
1.111 pk 3887: set _C_LABEL(eintstack), %o0 ! cpuinfo.eintstack= _eintstack;
1.101 pk 3888: sethi %hi(_EINTSTACKP), %l0
3889: st %o0, [%l0 + %lo(_EINTSTACKP)]
1.1 deraadt 3890:
3891: /*
1.11 deraadt 3892: * Ready to run C code; finish bootstrap.
1.1 deraadt 3893: */
1.111 pk 3894: call _C_LABEL(bootstrap)
1.1 deraadt 3895: nop
1.11 deraadt 3896:
3897: /*
3898: * Call main. This returns to us after loading /sbin/init into
3899: * user space. (If the exec fails, main() does not return.)
3900: */
1.111 pk 3901: call _C_LABEL(main)
1.11 deraadt 3902: clr %o0 ! our frame arg is ignored
1.89 pk 3903: /*NOTREACHED*/
3904:
3905: /*
3906: * Entry point for non-boot CPUs in MP systems.
3907: */
1.111 pk 3908: .globl _C_LABEL(cpu_hatch)
3909: _C_LABEL(cpu_hatch):
1.89 pk 3910: rd %psr, %g3 ! paranoia: make sure ...
3911: andn %g3, PSR_ET, %g3 ! we have traps off
3912: wr %g3, 0, %psr ! so that we can fiddle safely
3913: nop; nop; nop
3914:
3915: wr %g0, 0, %wim ! make sure we can set psr
3916: nop; nop; nop
3917: wr %g0, PSR_S|PSR_PS|PSR_PIL, %psr ! set initial psr
3918: nop; nop; nop
3919:
3920: wr %g0, 2, %wim ! set initial %wim (w1 invalid)
3921:
3922: /* Initialize Trap Base register */
1.111 pk 3923: sethi %hi(_C_LABEL(trapbase)), %o0
3924: ld [%o0+%lo(_C_LABEL(trapbase))], %g6
1.89 pk 3925: wr %g6, 0, %tbr
3926: nop; nop; nop ! paranoia
3927:
3928: /* Set up a stack */
3929: set USRSTACK - CCFSZ, %fp ! as if called from user code
1.111 pk 3930: sethi %hi(_C_LABEL(cpu_hatchstack)), %o0
3931: ld [%o0+%lo(_C_LABEL(cpu_hatchstack))], %o0
1.102 pk 3932: set USPACE - CCFSZ - 80, %sp
3933: add %sp, %o0, %sp
1.89 pk 3934:
3935: /* Enable traps */
3936: rd %psr, %l0
3937: wr %l0, PSR_ET, %psr
3938: nop; nop; nop
3939:
3940: /* Call C code */
1.111 pk 3941: sethi %hi(_C_LABEL(cpu_hatch_sc)), %o0
3942: call _C_LABEL(cpu_setup)
3943: ld [%o0+%lo(_C_LABEL(cpu_hatch_sc))], %o0
1.89 pk 3944:
3945: /* Idle here .. */
1.102 pk 3946: rd %psr, %l0
3947: andn %l0, PSR_PIL, %l0 ! psr &= ~PSR_PIL;
3948: wr %l0, 0, %psr ! (void) spl0();
3949: nop; nop; nop
1.89 pk 3950: 9: ba 9b
3951: nop
1.51 pk 3952: /*NOTREACHED*/
1.1 deraadt 3953:
1.63 pk 3954:
1.1 deraadt 3955: /*
3956: * The following code is copied to the top of the user stack when each
3957: * process is exec'ed, and signals are `trampolined' off it.
3958: *
3959: * When this code is run, the stack looks like:
3960: * [%sp] 64 bytes to which registers can be dumped
3961: * [%sp + 64] signal number (goes in %o0)
3962: * [%sp + 64 + 4] signal code (goes in %o1)
3963: * [%sp + 64 + 8] placeholder
3964: * [%sp + 64 + 12] argument for %o3, currently unsupported (always 0)
3965: * [%sp + 64 + 16] first word of saved state (sigcontext)
3966: * .
3967: * .
3968: * .
3969: * [%sp + NNN] last word of saved state
3970: * (followed by previous stack contents or top of signal stack).
3971: * The address of the function to call is in %g1; the old %g1 and %o0
3972: * have already been saved in the sigcontext. We are running in a clean
3973: * window, all previous windows now being saved to the stack.
3974: *
3975: * Note that [%sp + 64 + 8] == %sp + 64 + 16. The copy at %sp+64+8
3976: * will eventually be removed, with a hole left in its place, if things
3977: * work out.
3978: */
1.122 christos 3979: #define SAVE_STATE \
3980: /* \
3981: * XXX the `save' and `restore' below are unnecessary: should \
3982: * replace with simple arithmetic on %sp \
3983: * \
3984: * Make room on the stack for 32 %f registers + %fsr. This comes \
3985: * out to 33*4 or 132 bytes, but this must be aligned to a multiple \
3986: * of 8, or 136 bytes. \
3987: */ \
3988: save %sp, -CCFSZ - 136, %sp; \
3989: mov %g2, %l2; /* save globals in %l registers */ \
3990: mov %g3, %l3; \
3991: mov %g4, %l4; \
3992: mov %g5, %l5; \
3993: mov %g6, %l6; \
3994: mov %g7, %l7; \
3995: /* \
3996: * Saving the fpu registers is expensive, so do it iff the fsr \
3997: * stored in the sigcontext shows that the fpu is enabled. \
3998: */ \
3999: ld [%fp + 64 + 16 + SC_PSR_OFFSET], %l0; \
4000: sethi %hi(PSR_EF), %l1; /* FPU enable is too high for andcc */ \
4001: andcc %l0, %l1, %l0; /* %l0 = fpu enable bit */ \
4002: be 1f; /* if not set, skip the saves */ \
4003: rd %y, %l1; /* in any case, save %y */ \
4004: /* fpu is enabled, oh well */ \
4005: st %fsr, [%sp + CCFSZ + 0]; \
4006: std %f0, [%sp + CCFSZ + 8]; \
4007: std %f2, [%sp + CCFSZ + 16]; \
4008: std %f4, [%sp + CCFSZ + 24]; \
4009: std %f6, [%sp + CCFSZ + 32]; \
4010: std %f8, [%sp + CCFSZ + 40]; \
4011: std %f10, [%sp + CCFSZ + 48]; \
4012: std %f12, [%sp + CCFSZ + 56]; \
4013: std %f14, [%sp + CCFSZ + 64]; \
4014: std %f16, [%sp + CCFSZ + 72]; \
4015: std %f18, [%sp + CCFSZ + 80]; \
4016: std %f20, [%sp + CCFSZ + 88]; \
4017: std %f22, [%sp + CCFSZ + 96]; \
4018: std %f24, [%sp + CCFSZ + 104]; \
4019: std %f26, [%sp + CCFSZ + 112]; \
4020: std %f28, [%sp + CCFSZ + 120]; \
4021: std %f30, [%sp + CCFSZ + 128]; \
4022: 1:
4023:
4024: #define RESTORE_STATE \
4025: /* \
4026: * Now that the handler has returned, re-establish all the state \
4027: * we just saved above, then do a sigreturn. \
4028: */ \
4029: tst %l0; /* reload fpu registers? */ \
4030: be 1f; /* if not, skip the loads */ \
4031: wr %l1, %g0, %y; /* in any case, restore %y */ \
4032: ld [%sp + CCFSZ + 0], %fsr; \
4033: ldd [%sp + CCFSZ + 8], %f0; \
4034: ldd [%sp + CCFSZ + 16], %f2; \
4035: ldd [%sp + CCFSZ + 24], %f4; \
4036: ldd [%sp + CCFSZ + 32], %f6; \
4037: ldd [%sp + CCFSZ + 40], %f8; \
4038: ldd [%sp + CCFSZ + 48], %f10; \
4039: ldd [%sp + CCFSZ + 56], %f12; \
4040: ldd [%sp + CCFSZ + 64], %f14; \
4041: ldd [%sp + CCFSZ + 72], %f16; \
4042: ldd [%sp + CCFSZ + 80], %f18; \
4043: ldd [%sp + CCFSZ + 88], %f20; \
4044: ldd [%sp + CCFSZ + 96], %f22; \
4045: ldd [%sp + CCFSZ + 104], %f24; \
4046: ldd [%sp + CCFSZ + 112], %f26; \
4047: ldd [%sp + CCFSZ + 120], %f28; \
4048: ldd [%sp + CCFSZ + 128], %f30; \
4049: 1: \
4050: mov %l2, %g2; \
4051: mov %l3, %g3; \
4052: mov %l4, %g4; \
4053: mov %l5, %g5; \
4054: mov %l6, %g6; \
4055: mov %l7, %g7
4056:
1.111 pk 4057: .globl _C_LABEL(sigcode)
4058: .globl _C_LABEL(esigcode)
4059: _C_LABEL(sigcode):
1.1 deraadt 4060:
1.122 christos 4061: SAVE_STATE
4062:
1.1 deraadt 4063: ldd [%fp + 64], %o0 ! sig, code
4064: ld [%fp + 76], %o3 ! arg3
4065: call %g1 ! (*sa->sa_handler)(sig,code,scp,arg3)
4066: add %fp, 64 + 16, %o2 ! scp
4067:
1.122 christos 4068: RESTORE_STATE
1.1 deraadt 4069:
1.92 pk 4070: ! get registers back & set syscall #
4071: restore %g0, SYS___sigreturn14, %g1
1.1 deraadt 4072: add %sp, 64 + 16, %o0 ! compute scp
4073: t ST_SYSCALL ! sigreturn(scp)
4074: ! sigreturn does not return unless it fails
4075: mov SYS_exit, %g1 ! exit(errno)
4076: t ST_SYSCALL
1.111 pk 4077: _C_LABEL(esigcode):
1.41 christos 4078:
1.116 christos 4079: #ifdef COMPAT_SUNOS
4080: .globl _C_LABEL(sunos_sigcode)
4081: .globl _C_LABEL(sunos_esigcode)
4082: _C_LABEL(sunos_sigcode):
4083:
1.122 christos 4084: SAVE_STATE
4085:
1.116 christos 4086: ldd [%fp + 64], %o0 ! sig, code
4087: ld [%fp + 76], %o3 ! arg3
4088: call %g1 ! (*sa->sa_handler)(sig,code,scp,arg3)
4089: add %fp, 64 + 16, %o2 ! scp
4090:
1.122 christos 4091: RESTORE_STATE
1.116 christos 4092:
4093: ! get registers back & set syscall #
4094: restore %g0, SUNOS_SYS_sigreturn, %g1
4095: add %sp, 64 + 16, %o0 ! compute scp
4096: t ST_SYSCALL ! sigreturn(scp)
4097: ! sigreturn does not return unless it fails
4098: mov SUNOS_SYS_exit, %g1 ! exit(errno)
4099: t ST_SYSCALL
4100: _C_LABEL(sunos_esigcode):
4101: #endif /* COMPAT_SUNOS */
4102:
1.36 christos 4103: #ifdef COMPAT_SVR4
1.111 pk 4104: .globl _C_LABEL(svr4_sigcode)
4105: .globl _C_LABEL(svr4_esigcode)
4106: _C_LABEL(svr4_sigcode):
1.41 christos 4107:
1.122 christos 4108: SAVE_STATE
4109:
1.41 christos 4110: ldd [%fp + 64], %o0 ! sig, siginfo
4111: ld [%fp + 72], %o2 ! uctx
4112: call %g1 ! (*sa->sa_handler)(sig,siginfo,uctx)
4113: nop
4114:
1.122 christos 4115: RESTORE_STATE
1.41 christos 4116:
1.42 mycroft 4117: restore %g0, SVR4_SYS_context, %g1 ! get registers & set syscall #
1.41 christos 4118: mov 1, %o0
4119: add %sp, 64 + 16, %o1 ! compute ucontextp
4120: t ST_SYSCALL ! svr4_context(1, ucontextp)
4121: ! setcontext does not return unless it fails
4122: mov SYS_exit, %g1 ! exit(errno)
4123: t ST_SYSCALL
1.111 pk 4124: _C_LABEL(svr4_esigcode):
1.116 christos 4125: #endif /* COMPAT_SVR4 */
1.1 deraadt 4126:
4127: /*
4128: * Primitives
1.52 pk 4129: */
1.1 deraadt 4130:
1.63 pk 4131: /*
4132: * General-purpose NULL routine.
4133: */
4134: ENTRY(sparc_noop)
4135: retl
4136: nop
1.1 deraadt 4137:
4138: /*
1.24 deraadt 4139: * getfp() - get stack frame pointer
4140: */
4141: ENTRY(getfp)
4142: retl
4143: mov %fp, %o0
4144:
4145: /*
1.1 deraadt 4146: * copyinstr(fromaddr, toaddr, maxlength, &lencopied)
4147: *
4148: * Copy a null terminated string from the user address space into
4149: * the kernel address space.
4150: */
4151: ENTRY(copyinstr)
4152: ! %o0 = fromaddr, %o1 = toaddr, %o2 = maxlen, %o3 = &lencopied
1.125.2.1 bouyer 4153: mov %o1, %o5 ! save = toaddr;
4154: tst %o2 ! maxlen == 0?
4155: beq,a Lcstoolong ! yes, return ENAMETOOLONG
4156: sethi %hi(cpcb), %o4
4157:
1.1 deraadt 4158: set KERNBASE, %o4
4159: cmp %o0, %o4 ! fromaddr < KERNBASE?
1.125.2.1 bouyer 4160: blu Lcsdocopy ! yes, go do it
4161: sethi %hi(cpcb), %o4 ! (first instr of copy)
1.1 deraadt 4162:
4163: b Lcsdone ! no, return EFAULT
4164: mov EFAULT, %o0
4165:
4166: /*
4167: * copyoutstr(fromaddr, toaddr, maxlength, &lencopied)
4168: *
4169: * Copy a null terminated string from the kernel
4170: * address space to the user address space.
4171: */
4172: ENTRY(copyoutstr)
4173: ! %o0 = fromaddr, %o1 = toaddr, %o2 = maxlen, %o3 = &lencopied
1.125.2.1 bouyer 4174: mov %o1, %o5 ! save = toaddr;
4175: tst %o2 ! maxlen == 0?
4176: beq,a Lcstoolong ! yes, return ENAMETOOLONG
4177: sethi %hi(cpcb), %o4
4178:
1.1 deraadt 4179: set KERNBASE, %o4
4180: cmp %o1, %o4 ! toaddr < KERNBASE?
1.125.2.1 bouyer 4181: blu Lcsdocopy ! yes, go do it
1.111 pk 4182: sethi %hi(cpcb), %o4 ! (first instr of copy)
1.1 deraadt 4183:
4184: b Lcsdone ! no, return EFAULT
4185: mov EFAULT, %o0
4186:
4187: Lcsdocopy:
1.111 pk 4188: ! sethi %hi(cpcb), %o4 ! (done earlier)
4189: ld [%o4 + %lo(cpcb)], %o4 ! catch faults
1.125.2.1 bouyer 4190: set Lcsfault, %g1
4191: st %g1, [%o4 + PCB_ONFAULT]
1.1 deraadt 4192:
4193: ! XXX should do this in bigger chunks when possible
4194: 0: ! loop:
4195: ldsb [%o0], %g1 ! c = *fromaddr;
4196: tst %g1
4197: stb %g1, [%o1] ! *toaddr++ = c;
4198: be 1f ! if (c == NULL)
4199: inc %o1 ! goto ok;
4200: deccc %o2 ! if (--len > 0) {
1.125.2.1 bouyer 4201: bgu 0b ! fromaddr++;
1.1 deraadt 4202: inc %o0 ! goto loop;
4203: ! }
1.125.2.1 bouyer 4204: Lcstoolong: !
1.1 deraadt 4205: b Lcsdone ! error = ENAMETOOLONG;
4206: mov ENAMETOOLONG, %o0 ! goto done;
4207: 1: ! ok:
4208: clr %o0 ! error = 0;
4209: Lcsdone: ! done:
4210: sub %o1, %o5, %o1 ! len = to - save;
4211: tst %o3 ! if (lencopied)
4212: bnz,a 3f
4213: st %o1, [%o3] ! *lencopied = len;
4214: 3:
4215: retl ! cpcb->pcb_onfault = 0;
4216: st %g0, [%o4 + PCB_ONFAULT]! return (error);
4217:
4218: Lcsfault:
4219: b Lcsdone ! error = EFAULT;
4220: mov EFAULT, %o0 ! goto ret;
4221:
4222: /*
4223: * copystr(fromaddr, toaddr, maxlength, &lencopied)
4224: *
4225: * Copy a null terminated string from one point to another in
4226: * the kernel address space. (This is a leaf procedure, but
4227: * it does not seem that way to the C compiler.)
4228: */
4229: ENTRY(copystr)
4230: mov %o1, %o5 ! to0 = to;
1.125.2.1 bouyer 4231: tst %o2 ! if (maxlength == 0)
4232: beq,a 2f !
4233: mov ENAMETOOLONG, %o0 ! ret = ENAMETOOLONG; goto done;
4234:
1.1 deraadt 4235: 0: ! loop:
4236: ldsb [%o0], %o4 ! c = *from;
4237: tst %o4
4238: stb %o4, [%o1] ! *to++ = c;
4239: be 1f ! if (c == 0)
4240: inc %o1 ! goto ok;
4241: deccc %o2 ! if (--len > 0) {
1.125.2.1 bouyer 4242: bgu,a 0b ! from++;
1.1 deraadt 4243: inc %o0 ! goto loop;
4244: b 2f ! }
4245: mov ENAMETOOLONG, %o0 ! ret = ENAMETOOLONG; goto done;
4246: 1: ! ok:
4247: clr %o0 ! ret = 0;
4248: 2:
4249: sub %o1, %o5, %o1 ! len = to - to0;
4250: tst %o3 ! if (lencopied)
4251: bnz,a 3f
4252: st %o1, [%o3] ! *lencopied = len;
4253: 3:
4254: retl
4255: nop
4256:
1.52 pk 4257: /*
1.1 deraadt 4258: * Copyin(src, dst, len)
4259: *
4260: * Copy specified amount of data from user space into the kernel.
4261: */
4262: ENTRY(copyin)
4263: set KERNBASE, %o3
4264: cmp %o0, %o3 ! src < KERNBASE?
4265: blu,a Ldocopy ! yes, can try it
1.111 pk 4266: sethi %hi(cpcb), %o3
1.1 deraadt 4267:
4268: /* source address points into kernel space: return EFAULT */
4269: retl
4270: mov EFAULT, %o0
4271:
4272: /*
4273: * Copyout(src, dst, len)
4274: *
4275: * Copy specified amount of data from kernel to user space.
4276: * Just like copyin, except that the `dst' addresses are user space
4277: * rather than the `src' addresses.
4278: */
4279: ENTRY(copyout)
4280: set KERNBASE, %o3
4281: cmp %o1, %o3 ! dst < KERBASE?
4282: blu,a Ldocopy
1.111 pk 4283: sethi %hi(cpcb), %o3
1.1 deraadt 4284:
4285: /* destination address points into kernel space: return EFAULT */
4286: retl
4287: mov EFAULT, %o0
4288:
4289: /*
4290: * ******NOTE****** this depends on bcopy() not using %g7
4291: */
4292: Ldocopy:
1.111 pk 4293: ! sethi %hi(cpcb), %o3
4294: ld [%o3 + %lo(cpcb)], %o3
1.1 deraadt 4295: set Lcopyfault, %o4
4296: mov %o7, %g7 ! save return address
1.111 pk 4297: call _C_LABEL(bcopy) ! bcopy(src, dst, len)
1.1 deraadt 4298: st %o4, [%o3 + PCB_ONFAULT]
4299:
1.111 pk 4300: sethi %hi(cpcb), %o3
4301: ld [%o3 + %lo(cpcb)], %o3
1.1 deraadt 4302: st %g0, [%o3 + PCB_ONFAULT]
4303: jmp %g7 + 8
4304: clr %o0 ! return 0
4305:
4306: ! Copyin or copyout fault. Clear cpcb->pcb_onfault and return EFAULT.
4307: ! Note that although we were in bcopy, there is no state to clean up;
4308: ! the only special thing is that we have to return to [g7 + 8] rather than
4309: ! [o7 + 8].
4310: Lcopyfault:
1.111 pk 4311: sethi %hi(cpcb), %o3
4312: ld [%o3 + %lo(cpcb)], %o3
1.1 deraadt 4313: st %g0, [%o3 + PCB_ONFAULT]
4314: jmp %g7 + 8
4315: mov EFAULT, %o0
4316:
4317:
4318: /*
4319: * Write all user windows presently in the CPU back to the user's stack.
4320: * We just do `save' instructions until pcb_uw == 0.
4321: *
4322: * p = cpcb;
4323: * nsaves = 0;
4324: * while (p->pcb_uw > 0)
4325: * save(), nsaves++;
4326: * while (--nsaves >= 0)
4327: * restore();
4328: */
4329: ENTRY(write_user_windows)
1.111 pk 4330: sethi %hi(cpcb), %g6
4331: ld [%g6 + %lo(cpcb)], %g6
1.1 deraadt 4332: b 2f
4333: clr %g5
4334: 1:
4335: save %sp, -64, %sp
4336: 2:
4337: ld [%g6 + PCB_UW], %g7
4338: tst %g7
4339: bg,a 1b
4340: inc %g5
4341: 3:
4342: deccc %g5
4343: bge,a 3b
4344: restore
4345: retl
4346: nop
4347:
4348:
1.111 pk 4349: .comm _C_LABEL(want_resched),4
4350: .comm _C_LABEL(want_ast),4
1.1 deraadt 4351: /*
4352: * Masterpaddr is the p->p_addr of the last process on the processor.
4353: * XXX masterpaddr is almost the same as cpcb
4354: * XXX should delete this entirely
4355: */
1.111 pk 4356: .comm _C_LABEL(masterpaddr), 4
1.1 deraadt 4357:
4358: /*
4359: * Switch statistics (for later tweaking):
4360: * nswitchdiff = p1 => p2 (i.e., chose different process)
1.10 deraadt 4361: * nswitchexit = number of calls to switchexit()
1.111 pk 4362: * cnt.v_swtch = total calls to swtch+swtchexit
1.1 deraadt 4363: */
1.111 pk 4364: .comm _C_LABEL(nswitchdiff), 4
4365: .comm _C_LABEL(nswitchexit), 4
1.1 deraadt 4366:
4367: /*
1.10 deraadt 4368: * REGISTER USAGE IN cpu_switch AND switchexit:
1.1 deraadt 4369: * This is split into two phases, more or less
4370: * `before we locate a new proc' and `after'.
4371: * Some values are the same in both phases.
4372: * Note that the %o0-registers are not preserved across
4373: * the psr change when entering a new process, since this
4374: * usually changes the CWP field (hence heavy usage of %g's).
4375: *
4376: * %g1 = oldpsr (excluding ipl bits)
1.111 pk 4377: * %g2 = %hi(whichqs); newpsr
1.1 deraadt 4378: * %g3 = p
4379: * %g4 = lastproc
4380: * %g5 = <free>; newpcb
1.111 pk 4381: * %g6 = %hi(cpcb)
4382: * %g7 = %hi(curproc)
1.1 deraadt 4383: * %o0 = tmp 1
4384: * %o1 = tmp 2
4385: * %o2 = tmp 3
4386: * %o3 = tmp 4; whichqs; vm
4387: * %o4 = tmp 4; which; sswap
4388: * %o5 = tmp 5; q; <free>
4389: */
4390:
4391: /*
1.125.2.1 bouyer 4392: * When calling external functions from cpu_switch() and idle(), we must
4393: * preserve the global registers mentioned above across the call. We also
4394: * set up a stack frame since we will be running in our caller's frame
4395: * in cpu_switch().
4396: */
4397: #define SAVE_GLOBALS_AND_CALL(name) \
4398: save %sp, -CCFSZ, %sp; \
4399: mov %g1, %i0; \
4400: mov %g2, %i1; \
4401: mov %g3, %i2; \
4402: mov %g4, %i3; \
4403: mov %g6, %i4; \
4404: call _C_LABEL(name); \
4405: mov %g7, %i5; \
4406: mov %i5, %g7; \
4407: mov %i4, %g6; \
4408: mov %i3, %g4; \
4409: mov %i2, %g3; \
4410: mov %i1, %g2; \
4411: mov %i0, %g1; \
4412: restore
4413:
4414:
4415: /*
1.10 deraadt 4416: * switchexit is called only from cpu_exit() before the current process
1.88 thorpej 4417: * has freed its vmspace and kernel stack; we must schedule them to be
4418: * freed. (curproc is already NULL.)
1.1 deraadt 4419: *
4420: * We lay the process to rest by changing to the `idle' kernel stack,
4421: * and note that the `last loaded process' is nonexistent.
4422: */
1.10 deraadt 4423: ENTRY(switchexit)
1.88 thorpej 4424: mov %o0, %g2 ! save proc for exit2() call
1.1 deraadt 4425:
4426: /*
4427: * Change pcb to idle u. area, i.e., set %sp to top of stack
1.111 pk 4428: * and %psr to PSR_S|PSR_ET, and set cpcb to point to idle_u.
1.125.2.1 bouyer 4429: * Once we have left the old stack, we can call exit2() to
1.1 deraadt 4430: * destroy it. Call it any sooner and the register windows
4431: * go bye-bye.
4432: */
1.99 pk 4433: #if defined(MULTIPROCESSOR)
1.111 pk 4434: sethi %hi(IDLE_UP), %g5
4435: ld [%g5 + %lo(IDLE_UP)], %g5
1.99 pk 4436: #else
1.111 pk 4437: set _C_LABEL(idle_u), %g5
1.99 pk 4438: #endif
1.111 pk 4439: sethi %hi(cpcb), %g6
1.1 deraadt 4440: mov 1, %g7
4441: wr %g0, PSR_S, %psr ! change to window 0, traps off
4442: wr %g0, 2, %wim ! and make window 1 the trap window
1.111 pk 4443: st %g5, [%g6 + %lo(cpcb)] ! cpcb = &idle_u
1.1 deraadt 4444: st %g7, [%g5 + PCB_WIM] ! idle_u.pcb_wim = log2(2) = 1
1.100 pk 4445: #if defined(MULTIPROCESSOR)
4446: set USPACE-CCFSZ, %o1 !
4447: add %g5, %o1, %sp ! set new %sp
4448: #else
1.111 pk 4449: set _C_LABEL(idle_u) + USPACE-CCFSZ, %sp ! set new %sp
1.100 pk 4450: #endif
4451:
1.1 deraadt 4452: #ifdef DEBUG
1.99 pk 4453: mov %g5, %l6 ! %l6 = _idle_u
1.1 deraadt 4454: SET_SP_REDZONE(%l6, %l5)
4455: #endif
4456: wr %g0, PSR_S|PSR_ET, %psr ! and then enable traps
1.111 pk 4457: call _C_LABEL(exit2) ! exit2(p)
1.88 thorpej 4458: mov %g2, %o0
1.1 deraadt 4459:
4460: /*
1.10 deraadt 4461: * Now fall through to `the last switch'. %g6 was set to
1.125.2.1 bouyer 4462: * %hi(cpcb), but may have been clobbered in exit2(),
1.1 deraadt 4463: * so all the registers described below will be set here.
4464: *
4465: * REGISTER USAGE AT THIS POINT:
4466: * %g1 = oldpsr (excluding ipl bits)
1.111 pk 4467: * %g2 = %hi(whichqs)
1.1 deraadt 4468: * %g4 = lastproc
1.111 pk 4469: * %g6 = %hi(cpcb)
4470: * %g7 = %hi(curproc)
1.1 deraadt 4471: * %o0 = tmp 1
4472: * %o1 = tmp 2
4473: * %o3 = whichqs
4474: */
4475:
1.111 pk 4476: INCR(_C_LABEL(nswitchexit)) ! nswitchexit++;
4477: INCR(_C_LABEL(uvmexp)+V_SWTCH) ! cnt.v_switch++;
1.1 deraadt 4478:
4479: mov PSR_S|PSR_ET, %g1 ! oldpsr = PSR_S | PSR_ET;
1.125.2.1 bouyer 4480: sethi %hi(_C_LABEL(sched_whichqs)), %g2
1.1 deraadt 4481: clr %g4 ! lastproc = NULL;
1.111 pk 4482: sethi %hi(cpcb), %g6
4483: sethi %hi(curproc), %g7
1.125.2.1 bouyer 4484: st %g0, [%g7 + %lo(curproc)] ! curproc = NULL;
4485: b,a idle_enter_no_schedlock
1.1 deraadt 4486: /* FALLTHROUGH */
4487:
4488: /*
1.10 deraadt 4489: * When no processes are on the runq, switch
1.52 pk 4490: * idles here waiting for something to come ready.
1.1 deraadt 4491: * The registers are set up as noted above.
4492: */
1.125.2.1 bouyer 4493: idle:
4494: #if defined(MULTIPROCESSOR) || defined(LOCKDEBUG)
4495: /* Release the scheduler lock */
4496: SAVE_GLOBALS_AND_CALL(sched_unlock_idle)
4497: #endif
4498: idle_enter_no_schedlock:
1.1 deraadt 4499: wr %g1, 0, %psr ! (void) spl0();
1.111 pk 4500: 1: ! spin reading whichqs until nonzero
1.125.2.1 bouyer 4501: ld [%g2 + %lo(_C_LABEL(sched_whichqs))], %o3
1.1 deraadt 4502: tst %o3
1.125.2.1 bouyer 4503: #if defined(MULTIPROCESSOR) || defined(LOCKDEBUG)
4504: bnz,a idle_leave
4505: #else
1.1 deraadt 4506: bnz,a Lsw_scan
1.125.2.1 bouyer 4507: #endif
4508: wr %g1, PSR_PIL, %psr ! (void) splhigh();
4509:
4510: ! Check uvm.page_idle_zero
4511: sethi %hi(_C_LABEL(uvm) + UVM_PAGE_IDLE_ZERO), %o3
4512: ld [%o3 + %lo(_C_LABEL(uvm) + UVM_PAGE_IDLE_ZERO)], %o3
4513: tst %o3
4514: bz 1b
4515: nop
4516:
4517: SAVE_GLOBALS_AND_CALL(uvm_pageidlezero)
1.1 deraadt 4518: b,a 1b
4519:
1.125.2.1 bouyer 4520: #if defined(MULTIPROCESSOR) || defined(LOCKDEBUG)
4521: idle_leave:
4522: /* Before we leave the idle loop, detain the scheduler lock */
4523: nop;nop;nop; ! just wrote to %psr; delay before doing a `save'
4524: SAVE_GLOBALS_AND_CALL(sched_lock_idle)
4525: b,a Lsw_scan
4526: #endif
4527:
1.1 deraadt 4528: Lsw_panic_rq:
4529: sethi %hi(1f), %o0
1.111 pk 4530: call _C_LABEL(panic)
1.1 deraadt 4531: or %lo(1f), %o0, %o0
4532: Lsw_panic_wchan:
4533: sethi %hi(2f), %o0
1.111 pk 4534: call _C_LABEL(panic)
1.1 deraadt 4535: or %lo(2f), %o0, %o0
4536: Lsw_panic_srun:
4537: sethi %hi(3f), %o0
1.111 pk 4538: call _C_LABEL(panic)
1.1 deraadt 4539: or %lo(3f), %o0, %o0
1.10 deraadt 4540: 1: .asciz "switch rq"
4541: 2: .asciz "switch wchan"
4542: 3: .asciz "switch SRUN"
1.52 pk 4543: _ALIGN
1.1 deraadt 4544:
4545: /*
1.10 deraadt 4546: * cpu_switch() picks a process to run and runs it, saving the current
1.1 deraadt 4547: * one away. On the assumption that (since most workstations are
4548: * single user machines) the chances are quite good that the new
4549: * process will turn out to be the current process, we defer saving
4550: * it here until we have found someone to load. If that someone
4551: * is the current process we avoid both store and load.
4552: *
1.10 deraadt 4553: * cpu_switch() is always entered at splstatclock or splhigh.
1.1 deraadt 4554: *
4555: * IT MIGHT BE WORTH SAVING BEFORE ENTERING idle TO AVOID HAVING TO
4556: * SAVE LATER WHEN SOMEONE ELSE IS READY ... MUST MEASURE!
4557: */
1.111 pk 4558: .globl _C_LABEL(__ffstab)
1.10 deraadt 4559: ENTRY(cpu_switch)
1.1 deraadt 4560: /*
4561: * REGISTER USAGE AT THIS POINT:
4562: * %g1 = oldpsr (excluding ipl bits)
1.111 pk 4563: * %g2 = %hi(whichqs)
1.1 deraadt 4564: * %g3 = p
4565: * %g4 = lastproc
4566: * %g5 = tmp 0
1.111 pk 4567: * %g6 = %hi(cpcb)
4568: * %g7 = %hi(curproc)
1.1 deraadt 4569: * %o0 = tmp 1
4570: * %o1 = tmp 2
4571: * %o2 = tmp 3
4572: * %o3 = tmp 4, then at Lsw_scan, whichqs
4573: * %o4 = tmp 5, then at Lsw_scan, which
4574: * %o5 = tmp 6, then at Lsw_scan, q
4575: */
1.125.2.1 bouyer 4576: sethi %hi(_C_LABEL(sched_whichqs)), %g2 ! set up addr regs
1.111 pk 4577: sethi %hi(cpcb), %g6
4578: ld [%g6 + %lo(cpcb)], %o0
1.125.2.1 bouyer 4579: std %o6, [%o0 + PCB_SP] ! cpcb->pcb_<sp,pc> = <sp,pc>;
4580: rd %psr, %g1 ! oldpsr = %psr;
1.111 pk 4581: sethi %hi(curproc), %g7
4582: ld [%g7 + %lo(curproc)], %g4 ! lastproc = curproc;
1.125.2.1 bouyer 4583: st %g1, [%o0 + PCB_PSR] ! cpcb->pcb_psr = oldpsr;
4584: andn %g1, PSR_PIL, %g1 ! oldpsr &= ~PSR_PIL;
1.111 pk 4585: st %g0, [%g7 + %lo(curproc)] ! curproc = NULL;
1.1 deraadt 4586:
4587: Lsw_scan:
4588: nop; nop; nop ! paranoia
1.125.2.1 bouyer 4589: ld [%g2 + %lo(_C_LABEL(sched_whichqs))], %o3
1.1 deraadt 4590:
4591: /*
4592: * Optimized inline expansion of `which = ffs(whichqs) - 1';
4593: * branches to idle if ffs(whichqs) was 0.
4594: */
1.111 pk 4595: set _C_LABEL(__ffstab), %o2
1.1 deraadt 4596: andcc %o3, 0xff, %o1 ! byte 0 zero?
4597: bz,a 1f ! yes, try byte 1
4598: srl %o3, 8, %o0
4599: b 2f ! ffs = ffstab[byte0]; which = ffs - 1;
4600: ldsb [%o2 + %o1], %o0
4601: 1: andcc %o0, 0xff, %o1 ! byte 1 zero?
4602: bz,a 1f ! yes, try byte 2
4603: srl %o0, 8, %o0
4604: ldsb [%o2 + %o1], %o0 ! which = ffstab[byte1] + 7;
4605: b 3f
4606: add %o0, 7, %o4
4607: 1: andcc %o0, 0xff, %o1 ! byte 2 zero?
4608: bz,a 1f ! yes, try byte 3
4609: srl %o0, 8, %o0
4610: ldsb [%o2 + %o1], %o0 ! which = ffstab[byte2] + 15;
4611: b 3f
4612: add %o0, 15, %o4
4613: 1: ldsb [%o2 + %o0], %o0 ! ffs = ffstab[byte3] + 24
4614: addcc %o0, 24, %o0 ! (note that ffstab[0] == -24)
4615: bz idle ! if answer was 0, go idle
4616: EMPTY
4617: 2: sub %o0, 1, %o4 ! which = ffs(whichqs) - 1
4618: 3: /* end optimized inline expansion */
4619:
4620: /*
4621: * We found a nonempty run queue. Take its first process.
4622: */
1.125.2.1 bouyer 4623: set _C_LABEL(sched_qs), %o5 ! q = &qs[which];
1.1 deraadt 4624: sll %o4, 3, %o0
4625: add %o0, %o5, %o5
4626: ld [%o5], %g3 ! p = q->ph_link;
4627: cmp %g3, %o5 ! if (p == q)
1.10 deraadt 4628: be Lsw_panic_rq ! panic("switch rq");
1.1 deraadt 4629: EMPTY
1.10 deraadt 4630: ld [%g3], %o0 ! tmp0 = p->p_forw;
1.1 deraadt 4631: st %o0, [%o5] ! q->ph_link = tmp0;
1.10 deraadt 4632: st %o5, [%o0 + 4] ! tmp0->p_back = q;
1.1 deraadt 4633: cmp %o0, %o5 ! if (tmp0 == q)
4634: bne 1f
4635: EMPTY
4636: mov 1, %o1 ! whichqs &= ~(1 << which);
4637: sll %o1, %o4, %o1
4638: andn %o3, %o1, %o3
1.125.2.1 bouyer 4639: st %o3, [%g2 + %lo(_C_LABEL(sched_whichqs))]
1.1 deraadt 4640: 1:
4641: /*
4642: * PHASE TWO: NEW REGISTER USAGE:
4643: * %g1 = oldpsr (excluding ipl bits)
4644: * %g2 = newpsr
4645: * %g3 = p
4646: * %g4 = lastproc
4647: * %g5 = newpcb
1.111 pk 4648: * %g6 = %hi(cpcb)
4649: * %g7 = %hi(curproc)
1.1 deraadt 4650: * %o0 = tmp 1
4651: * %o1 = tmp 2
4652: * %o2 = tmp 3
4653: * %o3 = vm
4654: */
4655:
4656: /* firewalls */
4657: ld [%g3 + P_WCHAN], %o0 ! if (p->p_wchan)
4658: tst %o0
1.10 deraadt 4659: bne Lsw_panic_wchan ! panic("switch wchan");
1.1 deraadt 4660: EMPTY
4661: ldsb [%g3 + P_STAT], %o0 ! if (p->p_stat != SRUN)
4662: cmp %o0, SRUN
1.10 deraadt 4663: bne Lsw_panic_srun ! panic("switch SRUN");
1.1 deraadt 4664: EMPTY
4665:
4666: /*
4667: * Committed to running process p.
4668: * It may be the same as the one we were running before.
4669: */
1.125.2.1 bouyer 4670: mov SONPROC, %o0 ! p->p_stat = SONPROC;
4671: stb %o0, [%g3 + P_STAT]
4672:
4673: /* p->p_cpu initialized in fork1() for single-processor */
4674: #if defined(MULTIPROCESSOR)
4675: sethi %hi(_CISELFP), %o0 ! p->p_cpu = cpuinfo.ci_self;
4676: ld [%o0 + %lo(_CISELFP)], %o0
4677: st %o0, [%g3 + P_CPU]
4678: #endif
4679:
1.111 pk 4680: sethi %hi(_C_LABEL(want_resched)), %o0 ! want_resched = 0;
4681: st %g0, [%o0 + %lo(_C_LABEL(want_resched))]
1.125.2.1 bouyer 4682: #if defined(MULTIPROCESSOR) || defined(LOCKDEBUG)
4683: /* Done with the run queues; release the scheduler lock */
4684: SAVE_GLOBALS_AND_CALL(sched_unlock_idle)
4685: #endif
1.1 deraadt 4686: ld [%g3 + P_ADDR], %g5 ! newpcb = p->p_addr;
1.10 deraadt 4687: st %g0, [%g3 + 4] ! p->p_back = NULL;
1.1 deraadt 4688: ld [%g5 + PCB_PSR], %g2 ! newpsr = newpcb->pcb_psr;
1.111 pk 4689: st %g3, [%g7 + %lo(curproc)] ! curproc = p;
1.1 deraadt 4690:
4691: cmp %g3, %g4 ! p == lastproc?
4692: be,a Lsw_sameproc ! yes, go return 0
4693: wr %g2, 0, %psr ! (after restoring ipl)
4694:
4695: /*
4696: * Not the old process. Save the old process, if any;
4697: * then load p.
4698: */
4699: tst %g4
4700: be,a Lsw_load ! if no old process, go load
4701: wr %g1, (PIL_CLOCK << 8) | PSR_ET, %psr
4702:
1.111 pk 4703: INCR(_C_LABEL(nswitchdiff)) ! clobbers %o0,%o1
1.1 deraadt 4704: /*
4705: * save: write back all windows (including the current one).
4706: * XXX crude; knows nwindows <= 8
4707: */
4708: #define SAVE save %sp, -64, %sp
1.29 deraadt 4709: wb1: SAVE; SAVE; SAVE; SAVE; SAVE; SAVE; SAVE /* 7 of each: */
1.1 deraadt 4710: restore; restore; restore; restore; restore; restore; restore
4711:
4712: /*
4713: * Load the new process. To load, we must change stacks and
4714: * alter cpcb and %wim, hence we must disable traps. %psr is
4715: * currently equal to oldpsr (%g1) ^ (PIL_CLOCK << 8);
4716: * this means that PSR_ET is on. Likewise, PSR_ET is on
4717: * in newpsr (%g2), although we do not know newpsr's ipl.
4718: *
4719: * We also must load up the `in' and `local' registers.
4720: */
4721: wr %g1, (PIL_CLOCK << 8) | PSR_ET, %psr
4722: Lsw_load:
4723: ! wr %g1, (PIL_CLOCK << 8) | PSR_ET, %psr ! done above
4724: /* compute new wim */
4725: ld [%g5 + PCB_WIM], %o0
4726: mov 1, %o1
4727: sll %o1, %o0, %o0
4728: wr %o0, 0, %wim ! %wim = 1 << newpcb->pcb_wim;
1.76 pk 4729: /* Clear FP & CP enable bits, as well as the PIL field */
1.1 deraadt 4730: /* now must not change %psr for 3 more instrs */
1.76 pk 4731: /*1*/ set PSR_EF|PSR_EC|PSR_PIL, %o0
4732: /*2*/ andn %g2, %o0, %g2 ! newpsr &= ~(PSR_EF|PSR_EC|PSR_PIL);
1.1 deraadt 4733: /*3*/ nop
4734: /* set new psr, but with traps disabled */
4735: wr %g2, PSR_ET, %psr ! %psr = newpsr ^ PSR_ET;
4736: /* set new cpcb */
1.111 pk 4737: st %g5, [%g6 + %lo(cpcb)] ! cpcb = newpcb;
1.1 deraadt 4738: ldd [%g5 + PCB_SP], %o6 ! <sp,pc> = newpcb->pcb_<sp,pc>
4739: /* load window */
4740: ldd [%sp + (0*8)], %l0
4741: ldd [%sp + (1*8)], %l2
4742: ldd [%sp + (2*8)], %l4
4743: ldd [%sp + (3*8)], %l6
4744: ldd [%sp + (4*8)], %i0
4745: ldd [%sp + (5*8)], %i2
4746: ldd [%sp + (6*8)], %i4
4747: ldd [%sp + (7*8)], %i6
4748: #ifdef DEBUG
4749: mov %g5, %o0
4750: SET_SP_REDZONE(%o0, %o1)
4751: CHECK_SP_REDZONE(%o0, %o1)
4752: #endif
1.76 pk 4753: /* finally, enable traps and continue at splclock() */
4754: wr %g2, PIL_CLOCK << 8 , %psr ! psr = newpsr;
1.1 deraadt 4755:
4756: /*
4757: * Now running p. Make sure it has a context so that it
4758: * can talk about user space stuff. (Its pcb_uw is currently
4759: * zero so it is safe to have interrupts going here.)
4760: */
4761: ld [%g3 + P_VMSPACE], %o3 ! vm = p->p_vmspace;
1.71 pk 4762: ld [%o3 + VM_PMAP], %o3 ! pm = vm->vm_map.vm_pmap;
4763: ld [%o3 + PMAP_CTX], %o0 ! if (pm->pm_ctx != NULL)
1.1 deraadt 4764: tst %o0
4765: bnz,a Lsw_havectx ! goto havecontext;
1.71 pk 4766: ld [%o3 + PMAP_CTXNUM], %o0 ! load context number
1.1 deraadt 4767:
4768: /* p does not have a context: call ctx_alloc to get one */
4769: save %sp, -CCFSZ, %sp
1.111 pk 4770: call _C_LABEL(ctx_alloc) ! ctx_alloc(pm);
1.71 pk 4771: mov %i3, %o0
4772:
1.1 deraadt 4773: ret
4774: restore
4775:
4776: /* p does have a context: just switch to it */
4777: Lsw_havectx:
1.52 pk 4778: ! context is in %o0
1.103 pk 4779: ! pmap is in %o3
1.9 deraadt 4780: #if (defined(SUN4) || defined(SUN4C)) && defined(SUN4M)
1.111 pk 4781: sethi %hi(_C_LABEL(cputyp)), %o1 ! what cpu are we running on?
4782: ld [%o1 + %lo(_C_LABEL(cputyp))], %o1
1.13 deraadt 4783: cmp %o1, CPU_SUN4M
1.52 pk 4784: be 1f
1.9 deraadt 4785: nop
4786: #endif
4787: #if defined(SUN4) || defined(SUN4C)
1.1 deraadt 4788: set AC_CONTEXT, %o1
4789: retl
1.52 pk 4790: stba %o0, [%o1] ASI_CONTROL ! setcontext(vm->vm_pmap.pm_ctxnum);
1.9 deraadt 4791: #endif
4792: 1:
4793: #if defined(SUN4M)
1.86 pk 4794: /*
4795: * Flush caches that need to be flushed on context switch.
4796: * We know this is currently only necessary on the sun4m hypersparc.
4797: */
4798: set CPUINFO_VA+CPUINFO_PURE_VCACHE_FLS, %o2
4799: ld [%o2], %o2
4800: mov %o7, %g7 ! save return address
4801: jmpl %o2, %o7 ! this function must not clobber %o0 and %g7
4802: nop
4803:
1.9 deraadt 4804: set SRMMU_CXR, %o1
1.86 pk 4805: jmp %g7 + 8
1.52 pk 4806: sta %o0, [%o1] ASI_SRMMU ! setcontext(vm->vm_pmap.pm_ctxnum);
1.9 deraadt 4807: #endif
1.1 deraadt 4808:
4809: Lsw_sameproc:
4810: /*
4811: * We are resuming the process that was running at the
1.10 deraadt 4812: * call to switch(). Just set psr ipl and return.
1.1 deraadt 4813: */
4814: ! wr %g2, 0 %psr ! %psr = newpsr; (done earlier)
4815: nop
4816: retl
4817: nop
4818:
4819:
4820: /*
4821: * Snapshot the current process so that stack frames are up to date.
1.51 pk 4822: * Only used just before a crash dump.
1.1 deraadt 4823: */
4824: ENTRY(snapshot)
1.67 pk 4825: std %o6, [%o0 + PCB_SP] ! save sp
1.1 deraadt 4826: rd %psr, %o1 ! save psr
4827: st %o1, [%o0 + PCB_PSR]
4828:
4829: /*
1.10 deraadt 4830: * Just like switch(); same XXX comments apply.
1.1 deraadt 4831: * 7 of each. Minor tweak: the 7th restore is
4832: * done after a ret.
4833: */
1.51 pk 4834: SAVE; SAVE; SAVE; SAVE; SAVE; SAVE; SAVE
1.1 deraadt 4835: restore; restore; restore; restore; restore; restore; ret; restore
4836:
1.51 pk 4837:
4838: /*
1.125.2.2! bouyer 4839: * cpu_fork() arrange for proc_trampoline() to run after a process gets
! 4840: * chosen in switch(). The stack frame will contain a function pointer
! 4841: * in %l0, and an argument to pass to it in %l2.
1.51 pk 4842: *
4843: * If the function *(%l0) returns, we arrange for an immediate return
4844: * to user mode. This happens in two known cases: after execve(2) of init,
4845: * and when returning a child to user mode after a fork(2).
1.125.2.2! bouyer 4846: *
! 4847: * If were setting up a kernel thread, the function *(%l0) will not return.
1.51 pk 4848: */
4849: ENTRY(proc_trampoline)
1.125.2.2! bouyer 4850: /*
! 4851: * Note: cpu_fork() has set up a stack frame for us to run in,
! 4852: * so we can call other functions from here without using
! 4853: * `save ... restore'.
! 4854: */
! 4855: #ifdef MULTIPROCESSOR
! 4856: /* Finish setup in SMP environment: acquire locks etc. */
! 4857: call _C_LABEL(proc_trampoline_mp)
! 4858: nop
! 4859: #endif
! 4860:
! 4861: call %l0
1.51 pk 4862: mov %l1, %o0
4863:
4864: /*
4865: * Here we finish up as in syscall, but simplified. We need to
1.125.2.2! bouyer 4866: * fiddle pc and npc a bit, as execve() / setregs() will have
! 4867: * set npc only, anticipating that trap.c will advance past the
! 4868: * trap instruction; but we bypass that, so we must do it manually.
1.51 pk 4869: */
4870: mov PSR_S, %l0 ! user psr (no need to load it)
4871: !?wr %g0, 2, %wim ! %wim = 2
4872: ld [%sp + CCFSZ + 8], %l1 ! pc = tf->tf_npc from execve/fork
4873: b return_from_syscall
4874: add %l1, 4, %l2 ! npc = pc+4
1.1 deraadt 4875:
4876: /*
4877: * {fu,su}{,i}{byte,word}
4878: */
1.111 pk 4879: _ENTRY(fuiword)
1.1 deraadt 4880: ENTRY(fuword)
4881: set KERNBASE, %o2
4882: cmp %o0, %o2 ! if addr >= KERNBASE...
4883: bgeu Lfsbadaddr
4884: EMPTY
4885: btst 3, %o0 ! or has low bits set...
4886: bnz Lfsbadaddr ! go return -1
4887: EMPTY
1.111 pk 4888: sethi %hi(cpcb), %o2 ! cpcb->pcb_onfault = Lfserr;
4889: ld [%o2 + %lo(cpcb)], %o2
1.1 deraadt 4890: set Lfserr, %o3
4891: st %o3, [%o2 + PCB_ONFAULT]
4892: ld [%o0], %o0 ! fetch the word
4893: retl ! phew, made it, return the word
4894: st %g0, [%o2 + PCB_ONFAULT]! but first clear onfault
4895:
4896: Lfserr:
4897: st %g0, [%o2 + PCB_ONFAULT]! error in r/w, clear pcb_onfault
4898: Lfsbadaddr:
4899: retl ! and return error indicator
1.21 deraadt 4900: mov -1, %o0
1.1 deraadt 4901:
4902: /*
4903: * This is just like Lfserr, but it's a global label that allows
4904: * mem_access_fault() to check to see that we don't want to try to
4905: * page in the fault. It's used by fuswintr() etc.
4906: */
1.111 pk 4907: .globl _C_LABEL(Lfsbail)
4908: _C_LABEL(Lfsbail):
1.1 deraadt 4909: st %g0, [%o2 + PCB_ONFAULT]! error in r/w, clear pcb_onfault
4910: retl ! and return error indicator
1.21 deraadt 4911: mov -1, %o0
1.1 deraadt 4912:
4913: /*
4914: * Like fusword but callable from interrupt context.
4915: * Fails if data isn't resident.
4916: */
4917: ENTRY(fuswintr)
4918: set KERNBASE, %o2
4919: cmp %o0, %o2 ! if addr >= KERNBASE
4920: bgeu Lfsbadaddr ! return error
4921: EMPTY
1.111 pk 4922: sethi %hi(cpcb), %o2 ! cpcb->pcb_onfault = Lfsbail;
4923: ld [%o2 + %lo(cpcb)], %o2
4924: set _C_LABEL(Lfsbail), %o3
1.1 deraadt 4925: st %o3, [%o2 + PCB_ONFAULT]
4926: lduh [%o0], %o0 ! fetch the halfword
4927: retl ! made it
4928: st %g0, [%o2 + PCB_ONFAULT]! but first clear onfault
4929:
4930: ENTRY(fusword)
4931: set KERNBASE, %o2
4932: cmp %o0, %o2 ! if addr >= KERNBASE
4933: bgeu Lfsbadaddr ! return error
4934: EMPTY
1.111 pk 4935: sethi %hi(cpcb), %o2 ! cpcb->pcb_onfault = Lfserr;
4936: ld [%o2 + %lo(cpcb)], %o2
1.1 deraadt 4937: set Lfserr, %o3
4938: st %o3, [%o2 + PCB_ONFAULT]
4939: lduh [%o0], %o0 ! fetch the halfword
4940: retl ! made it
4941: st %g0, [%o2 + PCB_ONFAULT]! but first clear onfault
4942:
1.111 pk 4943: _ENTRY(fuibyte)
1.1 deraadt 4944: ENTRY(fubyte)
4945: set KERNBASE, %o2
4946: cmp %o0, %o2 ! if addr >= KERNBASE
4947: bgeu Lfsbadaddr ! return error
4948: EMPTY
1.111 pk 4949: sethi %hi(cpcb), %o2 ! cpcb->pcb_onfault = Lfserr;
4950: ld [%o2 + %lo(cpcb)], %o2
1.1 deraadt 4951: set Lfserr, %o3
4952: st %o3, [%o2 + PCB_ONFAULT]
4953: ldub [%o0], %o0 ! fetch the byte
4954: retl ! made it
4955: st %g0, [%o2 + PCB_ONFAULT]! but first clear onfault
4956:
1.111 pk 4957: _ENTRY(suiword)
1.1 deraadt 4958: ENTRY(suword)
4959: set KERNBASE, %o2
4960: cmp %o0, %o2 ! if addr >= KERNBASE ...
4961: bgeu Lfsbadaddr
4962: EMPTY
4963: btst 3, %o0 ! or has low bits set ...
4964: bnz Lfsbadaddr ! go return error
4965: EMPTY
1.111 pk 4966: sethi %hi(cpcb), %o2 ! cpcb->pcb_onfault = Lfserr;
4967: ld [%o2 + %lo(cpcb)], %o2
1.1 deraadt 4968: set Lfserr, %o3
4969: st %o3, [%o2 + PCB_ONFAULT]
4970: st %o1, [%o0] ! store the word
4971: st %g0, [%o2 + PCB_ONFAULT]! made it, clear onfault
4972: retl ! and return 0
4973: clr %o0
4974:
4975: ENTRY(suswintr)
4976: set KERNBASE, %o2
4977: cmp %o0, %o2 ! if addr >= KERNBASE
4978: bgeu Lfsbadaddr ! go return error
4979: EMPTY
1.111 pk 4980: sethi %hi(cpcb), %o2 ! cpcb->pcb_onfault = Lfsbail;
4981: ld [%o2 + %lo(cpcb)], %o2
4982: set _C_LABEL(Lfsbail), %o3
1.1 deraadt 4983: st %o3, [%o2 + PCB_ONFAULT]
4984: sth %o1, [%o0] ! store the halfword
4985: st %g0, [%o2 + PCB_ONFAULT]! made it, clear onfault
4986: retl ! and return 0
4987: clr %o0
4988:
4989: ENTRY(susword)
4990: set KERNBASE, %o2
4991: cmp %o0, %o2 ! if addr >= KERNBASE
4992: bgeu Lfsbadaddr ! go return error
4993: EMPTY
1.111 pk 4994: sethi %hi(cpcb), %o2 ! cpcb->pcb_onfault = Lfserr;
4995: ld [%o2 + %lo(cpcb)], %o2
1.1 deraadt 4996: set Lfserr, %o3
4997: st %o3, [%o2 + PCB_ONFAULT]
4998: sth %o1, [%o0] ! store the halfword
4999: st %g0, [%o2 + PCB_ONFAULT]! made it, clear onfault
5000: retl ! and return 0
5001: clr %o0
5002:
1.111 pk 5003: _ENTRY(suibyte)
1.1 deraadt 5004: ENTRY(subyte)
5005: set KERNBASE, %o2
5006: cmp %o0, %o2 ! if addr >= KERNBASE
5007: bgeu Lfsbadaddr ! go return error
5008: EMPTY
1.111 pk 5009: sethi %hi(cpcb), %o2 ! cpcb->pcb_onfault = Lfserr;
5010: ld [%o2 + %lo(cpcb)], %o2
1.1 deraadt 5011: set Lfserr, %o3
5012: st %o3, [%o2 + PCB_ONFAULT]
5013: stb %o1, [%o0] ! store the byte
5014: st %g0, [%o2 + PCB_ONFAULT]! made it, clear onfault
5015: retl ! and return 0
5016: clr %o0
5017:
5018: /* probeget and probeset are meant to be used during autoconfiguration */
5019:
5020: /*
5021: * probeget(addr, size) caddr_t addr; int size;
5022: *
5023: * Read or write a (byte,word,longword) from the given address.
5024: * Like {fu,su}{byte,halfword,word} but our caller is supposed
5025: * to know what he is doing... the address can be anywhere.
5026: *
5027: * We optimize for space, rather than time, here.
5028: */
5029: ENTRY(probeget)
5030: ! %o0 = addr, %o1 = (1,2,4)
1.111 pk 5031: sethi %hi(cpcb), %o2
5032: ld [%o2 + %lo(cpcb)], %o2 ! cpcb->pcb_onfault = Lfserr;
1.1 deraadt 5033: set Lfserr, %o5
5034: st %o5, [%o2 + PCB_ONFAULT]
5035: btst 1, %o1
5036: bnz,a 0f ! if (len & 1)
5037: ldub [%o0], %o0 ! value = *(char *)addr;
5038: 0: btst 2, %o1
5039: bnz,a 0f ! if (len & 2)
5040: lduh [%o0], %o0 ! value = *(short *)addr;
5041: 0: btst 4, %o1
5042: bnz,a 0f ! if (len & 4)
5043: ld [%o0], %o0 ! value = *(int *)addr;
5044: 0: retl ! made it, clear onfault and return
5045: st %g0, [%o2 + PCB_ONFAULT]
5046:
5047: /*
5048: * probeset(addr, size, val) caddr_t addr; int size, val;
5049: *
5050: * As above, but we return 0 on success.
5051: */
5052: ENTRY(probeset)
5053: ! %o0 = addr, %o1 = (1,2,4), %o2 = val
1.111 pk 5054: sethi %hi(cpcb), %o3
5055: ld [%o3 + %lo(cpcb)], %o3 ! cpcb->pcb_onfault = Lfserr;
1.1 deraadt 5056: set Lfserr, %o5
1.35 pk 5057: st %o5, [%o3 + PCB_ONFAULT]
1.1 deraadt 5058: btst 1, %o1
5059: bnz,a 0f ! if (len & 1)
5060: stb %o2, [%o0] ! *(char *)addr = value;
5061: 0: btst 2, %o1
5062: bnz,a 0f ! if (len & 2)
5063: sth %o2, [%o0] ! *(short *)addr = value;
5064: 0: btst 4, %o1
5065: bnz,a 0f ! if (len & 4)
5066: st %o2, [%o0] ! *(int *)addr = value;
5067: 0: clr %o0 ! made it, clear onfault and return 0
5068: retl
1.35 pk 5069: st %g0, [%o3 + PCB_ONFAULT]
1.21 deraadt 5070:
5071: /*
1.22 deraadt 5072: * int xldcontrolb(caddr_t, pcb)
5073: * %o0 %o1
1.21 deraadt 5074: *
5075: * read a byte from the specified address in ASI_CONTROL space.
5076: */
1.22 deraadt 5077: ENTRY(xldcontrolb)
1.111 pk 5078: !sethi %hi(cpcb), %o2
5079: !ld [%o2 + %lo(cpcb)], %o2 ! cpcb->pcb_onfault = Lfsbail;
1.22 deraadt 5080: or %o1, %g0, %o2 ! %o2 = %o1
1.111 pk 5081: set _C_LABEL(Lfsbail), %o5
1.21 deraadt 5082: st %o5, [%o2 + PCB_ONFAULT]
5083: lduba [%o0] ASI_CONTROL, %o0 ! read
5084: 0: retl
1.1 deraadt 5085: st %g0, [%o2 + PCB_ONFAULT]
1.78 pk 5086:
5087: /*
5088: * int fkbyte(caddr_t, pcb)
5089: * %o0 %o1
5090: *
5091: * Just like fubyte(), but for kernel space.
5092: * (currently used to work around unexplained transient bus errors
5093: * when reading the VME interrupt vector)
5094: */
5095: ENTRY(fkbyte)
5096: or %o1, %g0, %o2 ! %o2 = %o1
1.111 pk 5097: set _C_LABEL(Lfsbail), %o5
1.78 pk 5098: st %o5, [%o2 + PCB_ONFAULT]
5099: ldub [%o0], %o0 ! fetch the byte
5100: retl ! made it
5101: st %g0, [%o2 + PCB_ONFAULT]! but first clear onfault
1.1 deraadt 5102:
1.93 pk 5103:
5104: /*
5105: * Insert entry into doubly-linked queue.
5106: * We could just do this in C, but gcc does not do leaves well (yet).
5107: */
5108: ENTRY(_insque)
5109: ! %o0 = e = what to insert; %o1 = after = entry to insert after
5110: st %o1, [%o0 + 4] ! e->prev = after;
5111: ld [%o1], %o2 ! tmp = after->next;
5112: st %o2, [%o0] ! e->next = tmp;
5113: st %o0, [%o1] ! after->next = e;
5114: retl
5115: st %o0, [%o2 + 4] ! tmp->prev = e;
5116:
5117:
5118: /*
5119: * Remove entry from doubly-linked queue.
5120: */
5121: ENTRY(_remque)
5122: ! %o0 = e = what to remove
5123: ld [%o0], %o1 ! n = e->next;
5124: ld [%o0 + 4], %o2 ! p = e->prev;
5125: st %o2, [%o1 + 4] ! n->prev = p;
5126: retl
5127: st %o1, [%o2] ! p->next = n;
1.1 deraadt 5128:
5129: /*
5130: * copywords(src, dst, nbytes)
5131: *
5132: * Copy `nbytes' bytes from src to dst, both of which are word-aligned;
5133: * nbytes is a multiple of four. It may, however, be zero, in which case
5134: * nothing is to be copied.
5135: */
5136: ENTRY(copywords)
5137: ! %o0 = src, %o1 = dst, %o2 = nbytes
5138: b 1f
5139: deccc 4, %o2
5140: 0:
5141: st %o3, [%o1 + %o2]
5142: deccc 4, %o2 ! while ((n -= 4) >= 0)
5143: 1:
5144: bge,a 0b ! *(int *)(dst+n) = *(int *)(src+n);
5145: ld [%o0 + %o2], %o3
5146: retl
5147: nop
5148:
5149: /*
5150: * qcopy(src, dst, nbytes)
5151: *
5152: * (q for `quad' or `quick', as opposed to b for byte/block copy)
5153: *
5154: * Just like copywords, but everything is multiples of 8.
5155: */
5156: ENTRY(qcopy)
5157: b 1f
5158: deccc 8, %o2
5159: 0:
5160: std %o4, [%o1 + %o2]
5161: deccc 8, %o2
5162: 1:
5163: bge,a 0b
5164: ldd [%o0 + %o2], %o4
5165: retl
5166: nop
5167:
5168: /*
5169: * qzero(addr, nbytes)
5170: *
5171: * Zeroes `nbytes' bytes of a quad-aligned virtual address,
5172: * where nbytes is itself a multiple of 8.
5173: */
5174: ENTRY(qzero)
5175: ! %o0 = addr, %o1 = len (in bytes)
5176: clr %g1
5177: 0:
5178: deccc 8, %o1 ! while ((n =- 8) >= 0)
5179: bge,a 0b
5180: std %g0, [%o0 + %o1] ! *(quad *)(addr + n) = 0;
5181: retl
5182: nop
5183:
5184: /*
1.83 mycroft 5185: * kernel bcopy
1.1 deraadt 5186: * Assumes regions do not overlap; has no useful return value.
5187: *
5188: * Must not use %g7 (see copyin/copyout above).
5189: */
5190:
5191: #define BCOPY_SMALL 32 /* if < 32, copy by bytes */
5192:
5193: ENTRY(bcopy)
5194: cmp %o2, BCOPY_SMALL
5195: Lbcopy_start:
5196: bge,a Lbcopy_fancy ! if >= this many, go be fancy.
5197: btst 7, %o0 ! (part of being fancy)
5198:
5199: /*
5200: * Not much to copy, just do it a byte at a time.
5201: */
5202: deccc %o2 ! while (--len >= 0)
5203: bl 1f
5204: EMPTY
5205: 0:
5206: inc %o0
5207: ldsb [%o0 - 1], %o4 ! (++dst)[-1] = *src++;
5208: stb %o4, [%o1]
5209: deccc %o2
5210: bge 0b
5211: inc %o1
5212: 1:
5213: retl
1.80 mrg 5214: nop
1.1 deraadt 5215: /* NOTREACHED */
5216:
5217: /*
5218: * Plenty of data to copy, so try to do it optimally.
5219: */
5220: Lbcopy_fancy:
5221: ! check for common case first: everything lines up.
5222: ! btst 7, %o0 ! done already
5223: bne 1f
5224: EMPTY
5225: btst 7, %o1
5226: be,a Lbcopy_doubles
5227: dec 8, %o2 ! if all lined up, len -= 8, goto bcopy_doubes
5228:
5229: ! If the low bits match, we can make these line up.
5230: 1:
5231: xor %o0, %o1, %o3 ! t = src ^ dst;
5232: btst 1, %o3 ! if (t & 1) {
5233: be,a 1f
5234: btst 1, %o0 ! [delay slot: if (src & 1)]
5235:
5236: ! low bits do not match, must copy by bytes.
5237: 0:
5238: ldsb [%o0], %o4 ! do {
5239: inc %o0 ! (++dst)[-1] = *src++;
5240: inc %o1
5241: deccc %o2
5242: bnz 0b ! } while (--len != 0);
5243: stb %o4, [%o1 - 1]
5244: retl
1.80 mrg 5245: nop
1.1 deraadt 5246: /* NOTREACHED */
5247:
5248: ! lowest bit matches, so we can copy by words, if nothing else
5249: 1:
5250: be,a 1f ! if (src & 1) {
5251: btst 2, %o3 ! [delay slot: if (t & 2)]
5252:
5253: ! although low bits match, both are 1: must copy 1 byte to align
5254: ldsb [%o0], %o4 ! *dst++ = *src++;
5255: stb %o4, [%o1]
5256: inc %o0
5257: inc %o1
5258: dec %o2 ! len--;
5259: btst 2, %o3 ! } [if (t & 2)]
5260: 1:
5261: be,a 1f ! if (t & 2) {
5262: btst 2, %o0 ! [delay slot: if (src & 2)]
5263: dec 2, %o2 ! len -= 2;
5264: 0:
5265: ldsh [%o0], %o4 ! do {
5266: sth %o4, [%o1] ! *(short *)dst = *(short *)src;
5267: inc 2, %o0 ! dst += 2, src += 2;
5268: deccc 2, %o2 ! } while ((len -= 2) >= 0);
5269: bge 0b
5270: inc 2, %o1
5271: b Lbcopy_mopb ! goto mop_up_byte;
5272: btst 1, %o2 ! } [delay slot: if (len & 1)]
5273: /* NOTREACHED */
5274:
5275: ! low two bits match, so we can copy by longwords
5276: 1:
5277: be,a 1f ! if (src & 2) {
5278: btst 4, %o3 ! [delay slot: if (t & 4)]
5279:
5280: ! although low 2 bits match, they are 10: must copy one short to align
5281: ldsh [%o0], %o4 ! (*short *)dst = *(short *)src;
5282: sth %o4, [%o1]
5283: inc 2, %o0 ! dst += 2;
5284: inc 2, %o1 ! src += 2;
5285: dec 2, %o2 ! len -= 2;
5286: btst 4, %o3 ! } [if (t & 4)]
5287: 1:
5288: be,a 1f ! if (t & 4) {
5289: btst 4, %o0 ! [delay slot: if (src & 4)]
5290: dec 4, %o2 ! len -= 4;
5291: 0:
5292: ld [%o0], %o4 ! do {
5293: st %o4, [%o1] ! *(int *)dst = *(int *)src;
5294: inc 4, %o0 ! dst += 4, src += 4;
5295: deccc 4, %o2 ! } while ((len -= 4) >= 0);
5296: bge 0b
5297: inc 4, %o1
5298: b Lbcopy_mopw ! goto mop_up_word_and_byte;
5299: btst 2, %o2 ! } [delay slot: if (len & 2)]
5300: /* NOTREACHED */
5301:
5302: ! low three bits match, so we can copy by doublewords
5303: 1:
5304: be 1f ! if (src & 4) {
5305: dec 8, %o2 ! [delay slot: len -= 8]
5306: ld [%o0], %o4 ! *(int *)dst = *(int *)src;
5307: st %o4, [%o1]
5308: inc 4, %o0 ! dst += 4, src += 4, len -= 4;
5309: inc 4, %o1
5310: dec 4, %o2 ! }
5311: 1:
5312: Lbcopy_doubles:
5313: ldd [%o0], %o4 ! do {
5314: std %o4, [%o1] ! *(double *)dst = *(double *)src;
5315: inc 8, %o0 ! dst += 8, src += 8;
5316: deccc 8, %o2 ! } while ((len -= 8) >= 0);
5317: bge Lbcopy_doubles
5318: inc 8, %o1
5319:
5320: ! check for a usual case again (save work)
5321: btst 7, %o2 ! if ((len & 7) == 0)
5322: be Lbcopy_done ! goto bcopy_done;
5323:
5324: btst 4, %o2 ! if ((len & 4)) == 0)
5325: be,a Lbcopy_mopw ! goto mop_up_word_and_byte;
5326: btst 2, %o2 ! [delay slot: if (len & 2)]
5327: ld [%o0], %o4 ! *(int *)dst = *(int *)src;
5328: st %o4, [%o1]
5329: inc 4, %o0 ! dst += 4;
5330: inc 4, %o1 ! src += 4;
5331: btst 2, %o2 ! } [if (len & 2)]
5332:
5333: 1:
5334: ! mop up trailing word (if present) and byte (if present).
5335: Lbcopy_mopw:
5336: be Lbcopy_mopb ! no word, go mop up byte
5337: btst 1, %o2 ! [delay slot: if (len & 1)]
5338: ldsh [%o0], %o4 ! *(short *)dst = *(short *)src;
5339: be Lbcopy_done ! if ((len & 1) == 0) goto done;
5340: sth %o4, [%o1]
5341: ldsb [%o0 + 2], %o4 ! dst[2] = src[2];
5342: retl
1.80 mrg 5343: stb %o4, [%o1 + 2]
1.1 deraadt 5344: /* NOTREACHED */
5345:
5346: ! mop up trailing byte (if present).
5347: Lbcopy_mopb:
5348: bne,a 1f
5349: ldsb [%o0], %o4
5350:
5351: Lbcopy_done:
5352: retl
1.80 mrg 5353: nop
1.1 deraadt 5354:
5355: 1:
5356: retl
1.80 mrg 5357: stb %o4,[%o1]
1.1 deraadt 5358: /*
5359: * ovbcopy(src, dst, len): like bcopy, but regions may overlap.
5360: */
5361: ENTRY(ovbcopy)
5362: cmp %o0, %o1 ! src < dst?
5363: bgeu Lbcopy_start ! no, go copy forwards as via bcopy
5364: cmp %o2, BCOPY_SMALL! (check length for doublecopy first)
5365:
5366: /*
5367: * Since src comes before dst, and the regions might overlap,
5368: * we have to do the copy starting at the end and working backwards.
5369: */
5370: add %o2, %o0, %o0 ! src += len
5371: add %o2, %o1, %o1 ! dst += len
5372: bge,a Lback_fancy ! if len >= BCOPY_SMALL, go be fancy
5373: btst 3, %o0
5374:
5375: /*
5376: * Not much to copy, just do it a byte at a time.
5377: */
5378: deccc %o2 ! while (--len >= 0)
5379: bl 1f
5380: EMPTY
5381: 0:
5382: dec %o0 ! *--dst = *--src;
5383: ldsb [%o0], %o4
5384: dec %o1
5385: deccc %o2
5386: bge 0b
5387: stb %o4, [%o1]
5388: 1:
5389: retl
5390: nop
5391:
5392: /*
5393: * Plenty to copy, try to be optimal.
5394: * We only bother with word/halfword/byte copies here.
5395: */
5396: Lback_fancy:
5397: ! btst 3, %o0 ! done already
5398: bnz 1f ! if ((src & 3) == 0 &&
5399: btst 3, %o1 ! (dst & 3) == 0)
5400: bz,a Lback_words ! goto words;
5401: dec 4, %o2 ! (done early for word copy)
5402:
5403: 1:
5404: /*
5405: * See if the low bits match.
5406: */
5407: xor %o0, %o1, %o3 ! t = src ^ dst;
5408: btst 1, %o3
5409: bz,a 3f ! if (t & 1) == 0, can do better
5410: btst 1, %o0
5411:
5412: /*
5413: * Nope; gotta do byte copy.
5414: */
5415: 2:
5416: dec %o0 ! do {
5417: ldsb [%o0], %o4 ! *--dst = *--src;
5418: dec %o1
5419: deccc %o2 ! } while (--len != 0);
5420: bnz 2b
5421: stb %o4, [%o1]
5422: retl
5423: nop
5424:
5425: 3:
5426: /*
5427: * Can do halfword or word copy, but might have to copy 1 byte first.
5428: */
5429: ! btst 1, %o0 ! done earlier
5430: bz,a 4f ! if (src & 1) { /* copy 1 byte */
5431: btst 2, %o3 ! (done early)
5432: dec %o0 ! *--dst = *--src;
5433: ldsb [%o0], %o4
5434: dec %o1
5435: stb %o4, [%o1]
5436: dec %o2 ! len--;
5437: btst 2, %o3 ! }
5438:
5439: 4:
5440: /*
5441: * See if we can do a word copy ((t&2) == 0).
5442: */
5443: ! btst 2, %o3 ! done earlier
5444: bz,a 6f ! if (t & 2) == 0, can do word copy
5445: btst 2, %o0 ! (src&2, done early)
5446:
5447: /*
5448: * Gotta do halfword copy.
5449: */
5450: dec 2, %o2 ! len -= 2;
5451: 5:
5452: dec 2, %o0 ! do {
5453: ldsh [%o0], %o4 ! src -= 2;
5454: dec 2, %o1 ! dst -= 2;
5455: deccc 2, %o0 ! *(short *)dst = *(short *)src;
5456: bge 5b ! } while ((len -= 2) >= 0);
5457: sth %o4, [%o1]
5458: b Lback_mopb ! goto mop_up_byte;
5459: btst 1, %o2 ! (len&1, done early)
5460:
5461: 6:
5462: /*
5463: * We can do word copies, but we might have to copy
5464: * one halfword first.
5465: */
5466: ! btst 2, %o0 ! done already
5467: bz 7f ! if (src & 2) {
5468: dec 4, %o2 ! (len -= 4, done early)
5469: dec 2, %o0 ! src -= 2, dst -= 2;
5470: ldsh [%o0], %o4 ! *(short *)dst = *(short *)src;
5471: dec 2, %o1
5472: sth %o4, [%o1]
5473: dec 2, %o2 ! len -= 2;
5474: ! }
5475:
5476: 7:
5477: Lback_words:
5478: /*
5479: * Do word copies (backwards), then mop up trailing halfword
5480: * and byte if any.
5481: */
5482: ! dec 4, %o2 ! len -= 4, done already
5483: 0: ! do {
5484: dec 4, %o0 ! src -= 4;
5485: dec 4, %o1 ! src -= 4;
5486: ld [%o0], %o4 ! *(int *)dst = *(int *)src;
5487: deccc 4, %o2 ! } while ((len -= 4) >= 0);
5488: bge 0b
5489: st %o4, [%o1]
5490:
5491: /*
5492: * Check for trailing shortword.
5493: */
5494: btst 2, %o2 ! if (len & 2) {
5495: bz,a 1f
5496: btst 1, %o2 ! (len&1, done early)
5497: dec 2, %o0 ! src -= 2, dst -= 2;
5498: ldsh [%o0], %o4 ! *(short *)dst = *(short *)src;
5499: dec 2, %o1
5500: sth %o4, [%o1] ! }
5501: btst 1, %o2
5502:
5503: /*
5504: * Check for trailing byte.
5505: */
5506: 1:
5507: Lback_mopb:
5508: ! btst 1, %o2 ! (done already)
5509: bnz,a 1f ! if (len & 1) {
5510: ldsb [%o0 - 1], %o4 ! b = src[-1];
5511: retl
5512: nop
5513: 1:
5514: retl ! dst[-1] = b;
5515: stb %o4, [%o1 - 1] ! }
5516:
1.79 mrg 5517: /*
5518: * kcopy() is exactly like bcopy except that it set pcb_onfault such that
5519: * when a fault occurs, it is able to return -1 to indicate this to the
5520: * caller.
5521: */
5522: ENTRY(kcopy)
1.111 pk 5523: sethi %hi(cpcb), %o5 ! cpcb->pcb_onfault = Lkcerr;
5524: ld [%o5 + %lo(cpcb)], %o5
1.79 mrg 5525: set Lkcerr, %o3
1.107 mycroft 5526: ld [%o5 + PCB_ONFAULT], %g1! save current onfault handler
1.79 mrg 5527: st %o3, [%o5 + PCB_ONFAULT]
5528:
5529: cmp %o2, BCOPY_SMALL
5530: Lkcopy_start:
5531: bge,a Lkcopy_fancy ! if >= this many, go be fancy.
1.106 pk 5532: btst 7, %o0 ! (part of being fancy)
1.79 mrg 5533:
5534: /*
5535: * Not much to copy, just do it a byte at a time.
5536: */
5537: deccc %o2 ! while (--len >= 0)
1.108 mycroft 5538: bl 1f
5539: EMPTY
1.79 mrg 5540: 0:
1.107 mycroft 5541: ldsb [%o0], %o4 ! *dst++ = *src++;
1.79 mrg 5542: inc %o0
5543: stb %o4, [%o1]
5544: deccc %o2
5545: bge 0b
1.106 pk 5546: inc %o1
1.79 mrg 5547: 1:
1.106 pk 5548: st %g1, [%o5 + PCB_ONFAULT] ! restore onfault
1.79 mrg 5549: retl
1.106 pk 5550: mov 0, %o0 ! delay slot: return success
1.79 mrg 5551: /* NOTREACHED */
5552:
5553: /*
5554: * Plenty of data to copy, so try to do it optimally.
5555: */
5556: Lkcopy_fancy:
5557: ! check for common case first: everything lines up.
5558: ! btst 7, %o0 ! done already
5559: bne 1f
1.108 mycroft 5560: EMPTY
1.79 mrg 5561: btst 7, %o1
5562: be,a Lkcopy_doubles
1.106 pk 5563: dec 8, %o2 ! if all lined up, len -= 8, goto bcopy_doubes
1.79 mrg 5564:
5565: ! If the low bits match, we can make these line up.
5566: 1:
5567: xor %o0, %o1, %o3 ! t = src ^ dst;
5568: btst 1, %o3 ! if (t & 1) {
5569: be,a 1f
1.106 pk 5570: btst 1, %o0 ! [delay slot: if (src & 1)]
1.79 mrg 5571:
5572: ! low bits do not match, must copy by bytes.
5573: 0:
5574: ldsb [%o0], %o4 ! do {
1.107 mycroft 5575: inc %o0 ! *dst++ = *src++;
5576: stb %o4, [%o1]
1.79 mrg 5577: deccc %o2
5578: bnz 0b ! } while (--len != 0);
1.107 mycroft 5579: inc %o1
1.106 pk 5580: st %g1, [%o5 + PCB_ONFAULT] ! restore onfault
1.79 mrg 5581: retl
1.106 pk 5582: mov 0, %o0 ! delay slot: return success
1.79 mrg 5583: /* NOTREACHED */
5584:
5585: ! lowest bit matches, so we can copy by words, if nothing else
5586: 1:
5587: be,a 1f ! if (src & 1) {
1.106 pk 5588: btst 2, %o3 ! [delay slot: if (t & 2)]
1.79 mrg 5589:
5590: ! although low bits match, both are 1: must copy 1 byte to align
5591: ldsb [%o0], %o4 ! *dst++ = *src++;
1.107 mycroft 5592: inc %o0
1.79 mrg 5593: stb %o4, [%o1]
1.107 mycroft 5594: dec %o2 ! len--;
1.79 mrg 5595: inc %o1
5596: btst 2, %o3 ! } [if (t & 2)]
5597: 1:
5598: be,a 1f ! if (t & 2) {
1.106 pk 5599: btst 2, %o0 ! [delay slot: if (src & 2)]
1.79 mrg 5600: dec 2, %o2 ! len -= 2;
5601: 0:
5602: ldsh [%o0], %o4 ! do {
1.107 mycroft 5603: inc 2, %o0 ! dst += 2, src += 2;
1.79 mrg 5604: sth %o4, [%o1] ! *(short *)dst = *(short *)src;
5605: deccc 2, %o2 ! } while ((len -= 2) >= 0);
5606: bge 0b
1.106 pk 5607: inc 2, %o1
1.79 mrg 5608: b Lkcopy_mopb ! goto mop_up_byte;
1.106 pk 5609: btst 1, %o2 ! } [delay slot: if (len & 1)]
1.79 mrg 5610: /* NOTREACHED */
5611:
5612: ! low two bits match, so we can copy by longwords
5613: 1:
5614: be,a 1f ! if (src & 2) {
1.106 pk 5615: btst 4, %o3 ! [delay slot: if (t & 4)]
1.79 mrg 5616:
5617: ! although low 2 bits match, they are 10: must copy one short to align
5618: ldsh [%o0], %o4 ! (*short *)dst = *(short *)src;
1.107 mycroft 5619: inc 2, %o0 ! dst += 2;
1.79 mrg 5620: sth %o4, [%o1]
1.107 mycroft 5621: dec 2, %o2 ! len -= 2;
1.79 mrg 5622: inc 2, %o1 ! src += 2;
5623: btst 4, %o3 ! } [if (t & 4)]
5624: 1:
5625: be,a 1f ! if (t & 4) {
1.106 pk 5626: btst 4, %o0 ! [delay slot: if (src & 4)]
1.79 mrg 5627: dec 4, %o2 ! len -= 4;
5628: 0:
5629: ld [%o0], %o4 ! do {
1.107 mycroft 5630: inc 4, %o0 ! dst += 4, src += 4;
1.79 mrg 5631: st %o4, [%o1] ! *(int *)dst = *(int *)src;
5632: deccc 4, %o2 ! } while ((len -= 4) >= 0);
5633: bge 0b
1.106 pk 5634: inc 4, %o1
1.79 mrg 5635: b Lkcopy_mopw ! goto mop_up_word_and_byte;
1.106 pk 5636: btst 2, %o2 ! } [delay slot: if (len & 2)]
1.79 mrg 5637: /* NOTREACHED */
5638:
5639: ! low three bits match, so we can copy by doublewords
5640: 1:
5641: be 1f ! if (src & 4) {
1.106 pk 5642: dec 8, %o2 ! [delay slot: len -= 8]
1.79 mrg 5643: ld [%o0], %o4 ! *(int *)dst = *(int *)src;
1.107 mycroft 5644: inc 4, %o0 ! dst += 4, src += 4, len -= 4;
1.79 mrg 5645: st %o4, [%o1]
1.107 mycroft 5646: dec 4, %o2 ! }
1.79 mrg 5647: inc 4, %o1
5648: 1:
5649: Lkcopy_doubles:
5650: ! swap %o4 with %o2 during doubles copy, since %o5 is verboten
5651: mov %o2, %o4
5652: Lkcopy_doubles2:
5653: ldd [%o0], %o2 ! do {
1.107 mycroft 5654: inc 8, %o0 ! dst += 8, src += 8;
1.79 mrg 5655: std %o2, [%o1] ! *(double *)dst = *(double *)src;
5656: deccc 8, %o4 ! } while ((len -= 8) >= 0);
5657: bge Lkcopy_doubles2
5658: inc 8, %o1
5659: mov %o4, %o2 ! restore len
5660:
5661: ! check for a usual case again (save work)
5662: btst 7, %o2 ! if ((len & 7) == 0)
5663: be Lkcopy_done ! goto bcopy_done;
5664:
1.106 pk 5665: btst 4, %o2 ! if ((len & 4)) == 0)
1.79 mrg 5666: be,a Lkcopy_mopw ! goto mop_up_word_and_byte;
1.106 pk 5667: btst 2, %o2 ! [delay slot: if (len & 2)]
1.79 mrg 5668: ld [%o0], %o4 ! *(int *)dst = *(int *)src;
1.107 mycroft 5669: inc 4, %o0 ! dst += 4;
1.79 mrg 5670: st %o4, [%o1]
5671: inc 4, %o1 ! src += 4;
5672: btst 2, %o2 ! } [if (len & 2)]
5673:
5674: 1:
5675: ! mop up trailing word (if present) and byte (if present).
5676: Lkcopy_mopw:
5677: be Lkcopy_mopb ! no word, go mop up byte
1.106 pk 5678: btst 1, %o2 ! [delay slot: if (len & 1)]
1.79 mrg 5679: ldsh [%o0], %o4 ! *(short *)dst = *(short *)src;
5680: be Lkcopy_done ! if ((len & 1) == 0) goto done;
1.106 pk 5681: sth %o4, [%o1]
1.79 mrg 5682: ldsb [%o0 + 2], %o4 ! dst[2] = src[2];
5683: stb %o4, [%o1 + 2]
1.106 pk 5684: st %g1, [%o5 + PCB_ONFAULT]! restore onfault
1.79 mrg 5685: retl
1.106 pk 5686: mov 0, %o0 ! delay slot: return success
1.79 mrg 5687: /* NOTREACHED */
5688:
5689: ! mop up trailing byte (if present).
5690: Lkcopy_mopb:
5691: bne,a 1f
1.106 pk 5692: ldsb [%o0], %o4
1.79 mrg 5693:
5694: Lkcopy_done:
1.106 pk 5695: st %g1, [%o5 + PCB_ONFAULT] ! restore onfault
1.79 mrg 5696: retl
1.106 pk 5697: mov 0, %o0 ! delay slot: return success
1.108 mycroft 5698: /* NOTREACHED */
1.79 mrg 5699:
5700: 1:
1.107 mycroft 5701: stb %o4, [%o1]
5702: st %g1, [%o5 + PCB_ONFAULT] ! restore onfault
1.79 mrg 5703: retl
1.107 mycroft 5704: mov 0, %o0 ! delay slot: return success
1.108 mycroft 5705: /* NOTREACHED */
1.107 mycroft 5706:
1.79 mrg 5707: Lkcerr:
1.107 mycroft 5708: st %g1, [%o5 + PCB_ONFAULT] ! restore onfault
5709: retl
5710: mov EFAULT, %o0 ! delay slot: return error indicator
1.108 mycroft 5711: /* NOTREACHED */
1.1 deraadt 5712:
5713: /*
5714: * savefpstate(f) struct fpstate *f;
5715: *
5716: * Store the current FPU state. The first `st %fsr' may cause a trap;
5717: * our trap handler knows how to recover (by `returning' to savefpcont).
5718: */
5719: ENTRY(savefpstate)
5720: rd %psr, %o1 ! enable FP before we begin
5721: set PSR_EF, %o2
5722: or %o1, %o2, %o1
5723: wr %o1, 0, %psr
5724: /* do some setup work while we wait for PSR_EF to turn on */
5725: set FSR_QNE, %o5 ! QNE = 0x2000, too big for immediate
5726: clr %o3 ! qsize = 0;
5727: nop ! (still waiting for PSR_EF)
5728: special_fp_store:
5729: st %fsr, [%o0 + FS_FSR] ! f->fs_fsr = getfsr();
5730: /*
5731: * Even if the preceding instruction did not trap, the queue
5732: * is not necessarily empty: this state save might be happening
5733: * because user code tried to store %fsr and took the FPU
5734: * from `exception pending' mode to `exception' mode.
5735: * So we still have to check the blasted QNE bit.
5736: * With any luck it will usually not be set.
5737: */
5738: ld [%o0 + FS_FSR], %o4 ! if (f->fs_fsr & QNE)
5739: btst %o5, %o4
5740: bnz Lfp_storeq ! goto storeq;
5741: std %f0, [%o0 + FS_REGS + (4*0)] ! f->fs_f0 = etc;
5742: Lfp_finish:
5743: st %o3, [%o0 + FS_QSIZE] ! f->fs_qsize = qsize;
5744: std %f2, [%o0 + FS_REGS + (4*2)]
5745: std %f4, [%o0 + FS_REGS + (4*4)]
5746: std %f6, [%o0 + FS_REGS + (4*6)]
5747: std %f8, [%o0 + FS_REGS + (4*8)]
5748: std %f10, [%o0 + FS_REGS + (4*10)]
5749: std %f12, [%o0 + FS_REGS + (4*12)]
5750: std %f14, [%o0 + FS_REGS + (4*14)]
5751: std %f16, [%o0 + FS_REGS + (4*16)]
5752: std %f18, [%o0 + FS_REGS + (4*18)]
5753: std %f20, [%o0 + FS_REGS + (4*20)]
5754: std %f22, [%o0 + FS_REGS + (4*22)]
5755: std %f24, [%o0 + FS_REGS + (4*24)]
5756: std %f26, [%o0 + FS_REGS + (4*26)]
5757: std %f28, [%o0 + FS_REGS + (4*28)]
5758: retl
5759: std %f30, [%o0 + FS_REGS + (4*30)]
5760:
5761: /*
5762: * Store the (now known nonempty) FP queue.
5763: * We have to reread the fsr each time in order to get the new QNE bit.
5764: */
5765: Lfp_storeq:
5766: add %o0, FS_QUEUE, %o1 ! q = &f->fs_queue[0];
5767: 1:
5768: std %fq, [%o1 + %o3] ! q[qsize++] = fsr_qfront();
5769: st %fsr, [%o0 + FS_FSR] ! reread fsr
5770: ld [%o0 + FS_FSR], %o4 ! if fsr & QNE, loop
5771: btst %o5, %o4
5772: bnz 1b
5773: inc 8, %o3
5774: b Lfp_finish ! set qsize and finish storing fregs
5775: srl %o3, 3, %o3 ! (but first fix qsize)
5776:
5777: /*
5778: * The fsr store trapped. Do it again; this time it will not trap.
5779: * We could just have the trap handler return to the `st %fsr', but
5780: * if for some reason it *does* trap, that would lock us into a tight
5781: * loop. This way we panic instead. Whoopee.
5782: */
5783: savefpcont:
5784: b special_fp_store + 4 ! continue
5785: st %fsr, [%o0 + FS_FSR] ! but first finish the %fsr store
5786:
5787: /*
5788: * Load FPU state.
5789: */
5790: ENTRY(loadfpstate)
5791: rd %psr, %o1 ! enable FP before we begin
5792: set PSR_EF, %o2
5793: or %o1, %o2, %o1
5794: wr %o1, 0, %psr
5795: nop; nop; nop ! paranoia
5796: ldd [%o0 + FS_REGS + (4*0)], %f0
5797: ldd [%o0 + FS_REGS + (4*2)], %f2
5798: ldd [%o0 + FS_REGS + (4*4)], %f4
5799: ldd [%o0 + FS_REGS + (4*6)], %f6
5800: ldd [%o0 + FS_REGS + (4*8)], %f8
5801: ldd [%o0 + FS_REGS + (4*10)], %f10
5802: ldd [%o0 + FS_REGS + (4*12)], %f12
5803: ldd [%o0 + FS_REGS + (4*14)], %f14
5804: ldd [%o0 + FS_REGS + (4*16)], %f16
5805: ldd [%o0 + FS_REGS + (4*18)], %f18
5806: ldd [%o0 + FS_REGS + (4*20)], %f20
5807: ldd [%o0 + FS_REGS + (4*22)], %f22
5808: ldd [%o0 + FS_REGS + (4*24)], %f24
5809: ldd [%o0 + FS_REGS + (4*26)], %f26
5810: ldd [%o0 + FS_REGS + (4*28)], %f28
5811: ldd [%o0 + FS_REGS + (4*30)], %f30
5812: retl
5813: ld [%o0 + FS_FSR], %fsr ! setfsr(f->fs_fsr);
5814:
5815: /*
5816: * ienab_bis(bis) int bis;
5817: * ienab_bic(bic) int bic;
5818: *
5819: * Set and clear bits in the interrupt register.
1.52 pk 5820: */
5821:
5822: #if defined(SUN4M) && (defined(SUN4) || defined(SUN4C))
1.62 pk 5823: ENTRY(ienab_bis)
5824: NOP_ON_4M_13:
1.111 pk 5825: b,a _C_LABEL(ienab_bis_4_4c)
5826: b,a _C_LABEL(ienab_bis_4m)
1.62 pk 5827:
5828: ENTRY(ienab_bic)
5829: NOP_ON_4M_14:
1.111 pk 5830: b,a _C_LABEL(ienab_bic_4_4c)
5831: b,a _C_LABEL(ienab_bic_4m)
1.62 pk 5832: #endif
1.52 pk 5833:
5834: #if defined(SUN4) || defined(SUN4C)
5835: /*
1.1 deraadt 5836: * Since there are no read-modify-write instructions for this,
5837: * and one of the interrupts is nonmaskable, we must disable traps.
5838: */
1.52 pk 5839: #if defined(SUN4M)
1.68 mycroft 5840: ENTRY(ienab_bis_4_4c)
1.52 pk 5841: #else
1.1 deraadt 5842: ENTRY(ienab_bis)
1.52 pk 5843: #endif
1.1 deraadt 5844: ! %o0 = bits to set
5845: rd %psr, %o2
5846: wr %o2, PSR_ET, %psr ! disable traps
5847: nop; nop ! 3-instr delay until ET turns off
1.62 pk 5848: sethi %hi(INTRREG_VA), %o3
5849: ldub [%o3 + %lo(INTRREG_VA)], %o4
5850: or %o4, %o0, %o4 ! *INTRREG_VA |= bis;
5851: stb %o4, [%o3 + %lo(INTRREG_VA)]
1.1 deraadt 5852: wr %o2, 0, %psr ! reenable traps
5853: nop
5854: retl
5855: nop
5856:
1.52 pk 5857: #if defined(SUN4M)
1.68 mycroft 5858: ENTRY(ienab_bic_4_4c)
1.52 pk 5859: #else
1.1 deraadt 5860: ENTRY(ienab_bic)
1.52 pk 5861: #endif
1.1 deraadt 5862: ! %o0 = bits to clear
5863: rd %psr, %o2
5864: wr %o2, PSR_ET, %psr ! disable traps
5865: nop; nop
1.62 pk 5866: sethi %hi(INTRREG_VA), %o3
5867: ldub [%o3 + %lo(INTRREG_VA)], %o4
5868: andn %o4, %o0, %o4 ! *INTRREG_VA &=~ bic;
5869: stb %o4, [%o3 + %lo(INTRREG_VA)]
1.1 deraadt 5870: wr %o2, 0, %psr ! reenable traps
5871: nop
5872: retl
5873: nop
1.52 pk 5874: #endif
5875:
5876: #if defined(SUN4M)
5877: /*
5878: * sun4m has separate registers for clearing/setting the interrupt mask.
5879: */
5880: #if defined(SUN4) || defined(SUN4C)
5881: ENTRY(ienab_bis_4m)
5882: #else
5883: ENTRY(ienab_bis)
5884: #endif
5885: set ICR_SI_SET, %o1
5886: retl
5887: st %o0, [%o1]
5888:
5889: #if defined(SUN4) || defined(SUN4C)
5890: ENTRY(ienab_bic_4m)
5891: #else
5892: ENTRY(ienab_bic)
5893: #endif
5894: set ICR_SI_CLR, %o1
5895: retl
5896: st %o0, [%o1]
5897:
5898: /*
5899: * raise(cpu, level)
5900: */
5901: ENTRY(raise)
5902: ! *(ICR_PI_SET + cpu*_MAXNBPG) = PINTR_SINTRLEV(level)
5903: sethi %hi(1 << 16), %o2
5904: sll %o2, %o1, %o2
5905: set ICR_PI_SET, %o1
5906: set _MAXNBPG, %o3
5907: 1:
5908: subcc %o0, 1, %o0
5909: bpos,a 1b
5910: add %o1, %o3, %o1
5911: retl
5912: st %o2, [%o1]
5913:
1.62 pk 5914:
5915: /*
1.94 pk 5916: * Read Synchronous Fault Status registers.
5917: * On entry: %l1 == PC, %l3 == fault type, %l4 == storage, %l7 == return address
5918: * Only use %l5 and %l6.
5919: * Note: not C callable.
5920: */
1.111 pk 5921: _ENTRY(_C_LABEL(srmmu_get_syncflt))
5922: _ENTRY(_C_LABEL(hypersparc_get_syncflt))
1.94 pk 5923: set SRMMU_SFAR, %l5
5924: lda [%l5] ASI_SRMMU, %l5 ! sync virt addr; must be read first
5925: st %l5, [%l4 + 4] ! => dump.sfva
5926: set SRMMU_SFSR, %l5
5927: lda [%l5] ASI_SRMMU, %l5 ! get sync fault status register
5928: jmp %l7 + 8 ! return to caller
5929: st %l5, [%l4] ! => dump.sfsr
5930:
1.111 pk 5931: _ENTRY(_C_LABEL(viking_get_syncflt))
5932: _ENTRY(_C_LABEL(ms1_get_syncflt))
5933: _ENTRY(_C_LABEL(swift_get_syncflt))
5934: _ENTRY(_C_LABEL(turbosparc_get_syncflt))
5935: _ENTRY(_C_LABEL(cypress_get_syncflt))
1.62 pk 5936: cmp %l3, T_TEXTFAULT
5937: be,a 1f
1.94 pk 5938: mov %l1, %l5 ! use PC if type == T_TEXTFAULT
1.62 pk 5939:
1.94 pk 5940: set SRMMU_SFAR, %l5
5941: lda [%l5] ASI_SRMMU, %l5 ! sync virt addr; must be read first
1.62 pk 5942: 1:
1.94 pk 5943: st %l5, [%l4 + 4] ! => dump.sfva
1.62 pk 5944:
1.94 pk 5945: set SRMMU_SFSR, %l5
5946: lda [%l5] ASI_SRMMU, %l5 ! get sync fault status register
5947: jmp %l7 + 8 ! return to caller
5948: st %l5, [%l4] ! => dump.sfsr
1.62 pk 5949:
5950:
1.94 pk 5951: /*
5952: * Read Asynchronous Fault Status registers.
5953: * On entry: %o0 == &afsr, %o1 == &afar
5954: * Return 0 if async register are present.
5955: */
1.111 pk 5956: _ENTRY(_C_LABEL(srmmu_get_asyncflt))
1.94 pk 5957: set SRMMU_AFAR, %o4
5958: lda [%o4] ASI_SRMMU, %o4 ! get async fault address
5959: set SRMMU_AFSR, %o3 !
5960: st %o4, [%o1]
5961: lda [%o3] ASI_SRMMU, %o3 ! get async fault status
5962: st %o3, [%o0]
5963: retl
5964: clr %o0 ! return value
1.62 pk 5965:
1.111 pk 5966: _ENTRY(_C_LABEL(cypress_get_asyncflt))
5967: _ENTRY(_C_LABEL(hypersparc_get_asyncflt))
1.94 pk 5968: set SRMMU_AFSR, %o3 ! must read status before fault on HS
5969: lda [%o3] ASI_SRMMU, %o3 ! get async fault status
5970: st %o3, [%o0]
5971: btst AFSR_AFO, %o3 ! and only read fault address
5972: bz 1f ! if valid.
5973: set SRMMU_AFAR, %o4
5974: lda [%o4] ASI_SRMMU, %o4 ! get async fault address
5975: clr %o0 ! return value
1.62 pk 5976: retl
1.94 pk 5977: st %o4, [%o1]
1.62 pk 5978: 1:
5979: retl
1.94 pk 5980: clr %o0 ! return value
1.62 pk 5981:
1.111 pk 5982: _ENTRY(_C_LABEL(no_asyncflt_regs))
1.62 pk 5983: retl
1.94 pk 5984: mov 1, %o0 ! return value
1.86 pk 5985:
1.111 pk 5986: _ENTRY(_C_LABEL(hypersparc_pure_vcache_flush))
1.86 pk 5987: /*
5988: * Flush entire on-chip instruction cache, which is
5989: * a pure vitually-indexed/virtually-tagged cache.
5990: */
5991: retl
5992: sta %g0, [%g0] ASI_HICACHECLR
1.62 pk 5993:
1.52 pk 5994: #endif /* SUN4M */
1.1 deraadt 5995:
5996: /*
1.29 deraadt 5997: * void lo_microtime(struct timeval *tv)
1.1 deraadt 5998: *
5999: * LBL's sparc bsd 'microtime': We don't need to spl (so this routine
6000: * can be a leaf routine) and we don't keep a 'last' timeval (there
6001: * can't be two calls to this routine in a microsecond). This seems to
6002: * be about 20 times faster than the Sun code on an SS-2. - vj
6003: *
6004: * Read time values from slowest-changing to fastest-changing,
6005: * then re-read out to slowest. If the values read before
6006: * the innermost match those read after, the innermost value
6007: * is consistent with the outer values. If not, it may not
6008: * be and we must retry. Typically this loop runs only once;
6009: * occasionally it runs twice, and only rarely does it run longer.
6010: */
1.30 deraadt 6011: #if defined(SUN4)
1.29 deraadt 6012: ENTRY(lo_microtime)
1.30 deraadt 6013: #else
6014: ENTRY(microtime)
6015: #endif
1.111 pk 6016: sethi %hi(_C_LABEL(time)), %g2
1.68 mycroft 6017:
6018: #if defined(SUN4M) && !(defined(SUN4C) || defined(SUN4))
6019: sethi %hi(TIMERREG_VA+4), %g3
6020: or %g3, %lo(TIMERREG_VA+4), %g3
6021: #elif (defined(SUN4C) || defined(SUN4)) && !defined(SUN4M)
6022: sethi %hi(TIMERREG_VA), %g3
6023: or %g3, %lo(TIMERREG_VA), %g3
6024: #else
1.1 deraadt 6025: sethi %hi(TIMERREG_VA), %g3
1.62 pk 6026: or %g3, %lo(TIMERREG_VA), %g3
1.68 mycroft 6027: NOP_ON_4_4C_1:
1.62 pk 6028: add %g3, 4, %g3
1.68 mycroft 6029: #endif
1.62 pk 6030:
1.69 mycroft 6031: 2:
1.111 pk 6032: ldd [%g2+%lo(_C_LABEL(time))], %o2 ! time.tv_sec & time.tv_usec
1.62 pk 6033: ld [%g3], %o4 ! usec counter
1.111 pk 6034: ldd [%g2+%lo(_C_LABEL(time))], %g4 ! see if time values changed
1.1 deraadt 6035: cmp %g4, %o2
1.52 pk 6036: bne 2b ! if time.tv_sec changed
1.1 deraadt 6037: cmp %g5, %o3
1.52 pk 6038: bne 2b ! if time.tv_usec changed
1.1 deraadt 6039: tst %o4
6040:
1.52 pk 6041: bpos 3f ! reached limit?
1.1 deraadt 6042: srl %o4, TMR_SHIFT, %o4 ! convert counter to usec
1.111 pk 6043: sethi %hi(_C_LABEL(tick)), %g4 ! bump usec by 1 tick
6044: ld [%g4+%lo(_C_LABEL(tick))], %o1
1.1 deraadt 6045: set TMR_MASK, %g5
6046: add %o1, %o3, %o3
6047: and %o4, %g5, %o4
1.52 pk 6048: 3:
1.1 deraadt 6049: add %o4, %o3, %o3
6050: set 1000000, %g5 ! normalize usec value
6051: cmp %o3, %g5
1.52 pk 6052: bl,a 4f
1.1 deraadt 6053: st %o2, [%o0] ! (should be able to std here)
6054: add %o2, 1, %o2 ! overflow
6055: sub %o3, %g5, %o3
6056: st %o2, [%o0] ! (should be able to std here)
1.52 pk 6057: 4:
1.1 deraadt 6058: retl
6059: st %o3, [%o0+4]
6060:
1.54 pk 6061: /*
6062: * delay function
6063: *
6064: * void delay(N) -- delay N microseconds
6065: *
6066: * Register usage: %o0 = "N" number of usecs to go (counts down to zero)
6067: * %o1 = "timerblurb" (stays constant)
6068: * %o2 = counter for 1 usec (counts down from %o1 to zero)
6069: *
6070: */
6071:
6072: ENTRY(delay) ! %o0 = n
1.57 pk 6073: subcc %o0, %g0, %g0
6074: be 2f
6075:
1.111 pk 6076: sethi %hi(_C_LABEL(timerblurb)), %o1
6077: ld [%o1 + %lo(_C_LABEL(timerblurb))], %o1 ! %o1 = timerblurb
1.53 pk 6078:
1.57 pk 6079: addcc %o1, %g0, %o2 ! %o2 = cntr (start @ %o1), clear CCs
1.54 pk 6080: ! first time through only
6081:
6082: ! delay 1 usec
6083: 1: bne 1b ! come back here if not done
6084: subcc %o2, 1, %o2 ! %o2 = %o2 - 1 [delay slot]
1.53 pk 6085:
1.54 pk 6086: subcc %o0, 1, %o0 ! %o0 = %o0 - 1
6087: bne 1b ! done yet?
6088: addcc %o1, %g0, %o2 ! reinit %o2 and CCs [delay slot]
6089: ! harmless if not branching
1.57 pk 6090: 2:
1.54 pk 6091: retl ! return
6092: nop ! [delay slot]
1.53 pk 6093:
1.60 pk 6094: #if defined(KGDB) || defined(DDB) || defined(DIAGNOSTIC)
1.1 deraadt 6095: /*
6096: * Write all windows (user or otherwise), except the current one.
6097: *
6098: * THIS COULD BE DONE IN USER CODE
6099: */
6100: ENTRY(write_all_windows)
6101: /*
6102: * g2 = g1 = nwindows - 1;
6103: * while (--g1 > 0) save();
6104: * while (--g2 > 0) restore();
6105: */
1.111 pk 6106: sethi %hi(_C_LABEL(nwindows)), %g1
6107: ld [%g1 + %lo(_C_LABEL(nwindows))], %g1
1.1 deraadt 6108: dec %g1
6109: mov %g1, %g2
6110:
6111: 1: deccc %g1
6112: bg,a 1b
6113: save %sp, -64, %sp
6114:
6115: 2: deccc %g2
6116: bg,a 2b
6117: restore
6118:
6119: retl
6120: nop
6121: #endif /* KGDB */
6122:
1.8 pk 6123: ENTRY(setjmp)
6124: std %sp, [%o0+0] ! stack pointer & return pc
6125: st %fp, [%o0+8] ! frame pointer
6126: retl
6127: clr %o0
6128:
6129: Lpanic_ljmp:
6130: .asciz "longjmp botch"
1.52 pk 6131: _ALIGN
1.8 pk 6132:
6133: ENTRY(longjmp)
6134: addcc %o1, %g0, %g6 ! compute v ? v : 1 in a global register
6135: be,a 0f
6136: mov 1, %g6
6137: 0:
6138: mov %o0, %g1 ! save a in another global register
6139: ld [%g1+8], %g7 /* get caller's frame */
6140: 1:
6141: cmp %fp, %g7 ! compare against desired frame
6142: bl,a 1b ! if below,
6143: restore ! pop frame and loop
6144: be,a 2f ! if there,
6145: ldd [%g1+0], %o2 ! fetch return %sp and pc, and get out
6146:
6147: Llongjmpbotch:
6148: ! otherwise, went too far; bomb out
6149: save %sp, -CCFSZ, %sp /* preserve current window */
6150: sethi %hi(Lpanic_ljmp), %o0
1.111 pk 6151: call _C_LABEL(panic)
1.8 pk 6152: or %o0, %lo(Lpanic_ljmp), %o0;
6153: unimp 0
6154:
6155: 2:
6156: cmp %o2, %sp ! %sp must not decrease
6157: bge,a 3f
6158: mov %o2, %sp ! it is OK, put it in place
6159: b,a Llongjmpbotch
1.52 pk 6160: 3:
1.8 pk 6161: jmp %o3 + 8 ! success, return %g6
6162: mov %g6, %o0
6163:
1.1 deraadt 6164: .data
1.8 pk 6165: #ifdef DDB
1.111 pk 6166: .globl _C_LABEL(esym)
6167: _C_LABEL(esym):
1.117 christos 6168: .word 0
1.123 pk 6169: #endif
1.117 christos 6170: .globl _C_LABEL(bootinfo)
6171: _C_LABEL(bootinfo):
1.8 pk 6172: .word 0
1.1 deraadt 6173:
1.111 pk 6174: .globl _C_LABEL(proc0paddr)
6175: _C_LABEL(proc0paddr):
6176: .word _C_LABEL(u0) ! KVA of proc0 uarea
1.1 deraadt 6177:
6178: /* interrupt counters XXX THESE BELONG ELSEWHERE (if anywhere) */
1.111 pk 6179: .globl _C_LABEL(intrcnt), _C_LABEL(eintrcnt)
6180: .globl _C_LABEL(intrnames), _C_LABEL(eintrnames)
6181: _C_LABEL(intrnames):
1.1 deraadt 6182: .asciz "spur"
6183: .asciz "lev1"
6184: .asciz "lev2"
6185: .asciz "lev3"
6186: .asciz "lev4"
6187: .asciz "lev5"
6188: .asciz "lev6"
6189: .asciz "lev7"
6190: .asciz "lev8"
6191: .asciz "lev9"
6192: .asciz "clock"
6193: .asciz "lev11"
6194: .asciz "lev12"
6195: .asciz "lev13"
6196: .asciz "prof"
1.111 pk 6197: _C_LABEL(eintrnames):
1.52 pk 6198: _ALIGN
1.111 pk 6199: _C_LABEL(intrcnt):
1.1 deraadt 6200: .skip 4*15
1.111 pk 6201: _C_LABEL(eintrcnt):
1.1 deraadt 6202:
1.111 pk 6203: .comm _C_LABEL(nwindows), 4
6204: .comm _C_LABEL(romp), 4
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